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Friday, November 6, 2020 | History

3 edition of Unsteady transonic heat transfer in a transient facility found in the catalog.

Unsteady transonic heat transfer in a transient facility

Unsteady transonic heat transfer in a transient facility

semi-annual progress report

by

  • 84 Want to read
  • 1 Currently reading

Published by Syracuse University, Dept. of Mechanical and Aerospace Engineering, National Aeronautics and Space Administration, National Technical Information Service, distributor in [Syracuse, N.Y.], [Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Aerodynamic heat transfer.,
  • Gas flow.,
  • Rarefied gas dynamics.,
  • Solid surfaces.,
  • Transonic flow.,
  • Unsteady flow.

  • Edition Notes

    Statementprincipal investigator, J.E. LaGraff.
    SeriesNASA contractor report -- NASA CR-176145.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15425233M

    The unsteady transition characteristics of rotating stall have been studied experimentally in a single-stage transonic axial compressor. Three tested conditions in the near design and below design speed range, at tip relative Mach numbers from to , were performed. 3 Transient Heat Transfer (Convective Cooling or Heating) All the heat transfer problems we have examined have been steady state, but there are often circumstances in which the transient response to heat transfer is critical. An example is the heating up of gas turbine compressors as they are brought up to speed during take-off. The transonic stage is modeled in two dimensions with a variable span height for the rotor row. The analysis of the transonic turbine stage with stator trailing edge coolant ejection is carried out to compute the unsteady pressure and heat transfer distribution . Unsteady heat transfer measurements from transonic turbine blades at engine representative conditions in a transient facility WD Allan, R Ainsworth, S Thorpe Journal of engineering for gas turbines and power (4),


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Unsteady transonic heat transfer in a transient facility Download PDF EPUB FB2

The facility being constructed is a | Find, read and cite all the research you need on ResearchGate Article PDF Available Unsteady transonic heat transfer in a transient facility. A facility for making heat transfer measurements on solid surfaces using transient techniques is constructed.

The facility being constructed is a Ludweig tube with isentropic compression heating (LICH tube). The work completed is detailed as is the work remaining in order to complete the facility and make useful heat transfer measurements. The scope of the project is briefly discussed Author: J. Lagraff.

Get this from a library. Unsteady transonic heat transfer in a transient facility: semi-annual progress report. [J E LaGraff; United States. National Aeronautics and Space Administration.].

Unsteady transonic heat transfer in a transient facility. By J. Lagraff. Abstract. A facility for making heat transfer measurements on solid surfaces using transient techniques is constructed.

The facility being constructed is a Ludweig tube with isentropic compression heating (LICH tube). The work completed is detailed as is the work Author: J. Lagraff.

The unsteady heat transfer measurements about a transonic turbine blade at engine representative Mach and Reynolds numbers are presented. High density, fast-response thin film gauges are employed at the midheight by: This chapter is devoted to the transient state of heat conduction, i.e., the heating or cooling where the temperature of the solid body varies with time as well as in the space.

For bodies with a very high thermal conductivity combined with a low value of the convective heat transfer coefficient, lumped heat capacity analysis has Unsteady transonic heat transfer in a transient facility book presented. Journal of Thermophysics and Heat Transfer; Books.

AIAA Education Series; Library of Flight; Home > Publications > AIAA Journal > Vol Issue 12 > Transient Decay Times and Mean Values of Unsteady Oscillations in Transonic Flow Related Publications. Google Scholar. Search for. AbstractThe blade-tips of high-pressure turbine blades in a gas turbine engine are subjected to strong convective heat transfer and continued to present a significant design challenge to manufactur.

Advanced Heat and Mass Transfer by Amir Faghri, Yuwen Zhang, and John R. Howell Unsteady State Heat Conduction 15 where. Since the one-dimensional transient heat conduction problem under consideration is a linear problem, the sum of different for each value of n.

Actually, this is the classical framework for Unsteady-RANS. Consider this problem of 2D incompressible peristaltic flow with moving upper boundary given by Yu=Y0(1+a*cos(2*pi*(x-v0*t))) and bottom boundary the negative of this, or simulating half of. A Novel Transient Technique to Determine Recovery Temperature, Heat Transfer Coefficient, and Film Cooling Effectiveness Simultaneously in a Transonic Turbine Cascade Song Xue, Arnab Roy, Wing F.

Ng, Srinath V. Ekkad Mechanical Engineering Department Virginia Polytechnic Institute and State University Blacksburg, VA Abstract. Want to see more mechanical engineering instructional videos. Visit the Cal Poly Pomona Mechanical Engineering Department's video library, ME Online (http://.

The heat transfer and aerodynamic characteristics of a turbine nozzle guide vane with a supersonic exit velocity have been measured in a transient cascade facility.

The vane possesses a convergent-divergent passage, and this, together with a low trailing edge wedge angle, is seen to control the supersonic flow efficiently at design conditions. Heat transfer measurements made on the rotor blade of a full stage model turbine operating at engine representative conditions are presented.

The measurement technique of mounting thin film heat transfer gauges on enamel coated turbine blades enables the heat transfer rate to be measured across a frequency range of d.c. to kHz. Several researchers have investigated the coupled conjugate heat transfer analysis of turbine systems.

One of the first uses of conjugate heat transfer calculations in turbomachinery was the work of Bohn et al. Using the same code, Bohn et al. extended the conjugate approach to investigate leading edge film cooling. The showerhead at the leading edge is notorious for its complex thermal.

The paper focuses on the unsteady pressure field measured around the rotor midspan profile of the VKI Brite transonic turbine stage.

The understanding of the complex unsteady flow field is supported by a quasi-three-dimensional unsteady Navier–Stokes computation using a k-ω turbulence model and a modified version of the Abu-Ghannam and Shaw correlation for the onset of transition.

Reference is made to a parallel paper also presented at this conference[18] which gives full details of the developments that have been necessary to allow the measurement of steady and unsteady heat transfer in this facility. Finally, the future work programme and possible plans for further facility improvements are given.

The book deals with subsonic, transonic, and supersonic flows of relaxing systems, involving such nonequilibrium processes as phase transformations interphase heat and momentum transfer, dissociation, recombination, and vibrational relaxation.

The fundamentals of unsteady-state gasdynamics are outlined. Pertinent theoretical and experimental data on nozzle flows, flows through blade. Unsteady transonic heat transfer in a transient facility A facility for making heat transfer measurements on solid surfaces using transient techniques is constructed.

The facility being constructed is a Ludweig tube with isentropic compression heating (LICH tube). The work completed is detailed as is the work remaining in order to complete the. Mechanisms of unsteady mixing of heat carrier-I Unlike the previous studies of unsteady heat transfer in round and flat channels, when the heat transfer coefficient was analyzed within the framework of the one-dimensional flow description, the present article deals both with the temperature fields of heat carrier at the cross-section of the.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA A new transient facility for the study of time mean and unsteady aerodynamics and heat transfer in a high-pressure turbine has been commissioned and results are available. Ma, H.T., Zhang, Q and He L, Wang Z, and Wang L, “Cooling Injection Effects on a Transonic Squealer Tip: Part 1, Experimental Heat Transfer Results and CFD Validation”, ASME Journal of Engineering for Gas Turbines and Power, Vol,May, for use in transient facilities.

High bandwidth pressure, entropy and heat transfer instrumentation techniques have been developed in the ORF over the past decade (Ainsworth (), Payne (), and Thorpe ()). Supplemented by the use of unsteady CFD codes, these techniques have enabled the detailed study of the complex.

Hi. This is interesting. I've found that sometimes (using simple and pimpleFoam. I don't know much about multiregionFoam), when the flow is physically unsteady, the steady-state solver shows the same results as the transient one (ie. varying solution with iterations and high residuals) and sometimes, the solution is "trapped into an attractor" and an unphysical steady solution is found.

A unique non-rotating aerodynamic test facility is presented. It is designed for steady and unsteady transonic flow investigations in annular cascades. The fundamental advantage of this vehicle design, compared to a linear cascade facility, is the absence of boundary disturbances in the cascade and the self-adjustment of the flow periodicity.

•A variety of high-intensity heat transfer processes are involved with combustion and chemical reaction in the gasifier unit itself.

•The gas goes through various cleanup and pipe-delivery processes to get to our heat transfer processes involved in these stages are generally less intense.

An extensive set of unsteady pressure data was acquired along the midspan of a modern transonic fan blade for simulated flutter conditions. The data set was acquired in a nine-blade linear cascade with an oscillating middle blade to provide a database for the influence coefficient method to calculate instantaneous blade loadings.

In physics and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids—liquids and has several subdisciplines, including aerodynamics (the study of air and other gases in motion) and hydrodynamics (the study of liquids in motion). Fluid dynamics has a wide range of applications, including calculating forces and moments on aircraft.

Software Availability. All software and a manual (Heat Transfer Tools) consisting of about pages of documentation were originally published by McGraw-Hill in July In addition to the software, the CD-Rom includes about 60 additional pages in "pdf" files detailing the numerical modeling used "behind the scenes," making these materials very appropriate for use at the graduate level as.

Moss R W, Sheldrake C D, Ainsworth R W, Smith A D and Dancer S N Unsteady pressure and heat transfer measurements on a rotating blade surface in a transient facility Unsteady Flows in Turbomachines, Agard CP pp The book comprises eight chapters.

All chapters are saturated with much needed text supported and by simple and self-explanatory examples. Details Title Solutions to Problems in Heat Transfer. Transient Conduction or Unsteady Conduction Course Heat and Mass Transfer Author. Osama Mohammed Elmardi (Author) Year Pages Catalog Number.

both time-mean heat transfer levels and the unsteady time history. The Oxford Rotor is mounted in a transient turbine test facility based on an isentropic light piston tunnel (Ainsworth et al, ). The turbine is a transonic shroudless design of m tip diameter with a NGV to blade spacing of NGV axial chords.

Engine. Consider the homogeneous problem of transient heat conduction in a slab initially at a temperature T = f(x) and subject to convection losses into a medium at T = 0 at x = 0 and x = L. Convection heat transfer coefficients.

at x = 0 and x = L are, respectively. and. Assume the thermal conductivity of the. slab k. is constant. UNSTEADY STATE HEAT TRANSFER Heat transfer processes are prominent in engineering due to several applications in industry and environment. Heat transfer is central to the performance of propulsion systems, design of conventional space and water heating systems, cooling of electronic equipment, and many manufacturing processes (Campos 3).

Solutions to Problems in Heat Transfer. Transient Conduction or Unsteady Conduction-Osama Mohammed Elmardi Many heat transfer problems are time dependent. Such unsteady or transient problems typically arise when the boundary conditions of a system are changed. For example. The use of thin-film gauges in the Oxford Rotor Facility provides both time-mean heat transfer levels and the unsteady time history.

The time-mean level is not significantly affected by turbulence in the wake; this contrasts with the cascade response to freestream turbulence and simulated wake passing. Contact detailsDr David BacciTel: (2) Email: @ BiographyDr David Bacci is part of Oxford Thermofluids Laboratory (University of Oxford), where he holds a position of Postdoctoral Research Assistant in Heat Transfer and Aerodynamics.

He is also a Visiting Research Fellow at Cranfield University, working. Heat transfer is central to the performance of propulsion systems, design of conventional space and water heating systems, cooling of electronic equipment, and many manufacturing processes (Campos 3).

Unsteady state conduction is the class of heat transfer in which the temperature of the conducting medium varies with time and position. The incompressible unsteady flow past a channel with a pair of cylinders of rectangular cross section, placed in tandem normal to the flow, is investigated by numerical simulation.

The objective is to evaluate the effect of cylinder separation distance, S/H, on the flow behavior and heat transfer on. This large-scale facility is used to evaluate the aerodynamic and heat transfer characteristics of turbine blade geometries for future propulsion and power generation applications.

Unique features include the ability for a high degree of airflow turning, infinitely adjustable incidence angles, and high transonic flow rates.The new transonic facility has been constructed to obtain complete contours of heat transfer coefficient for both the end walls and blade surfaces using the transient liquid crystal technique, to measure pressure distributions and losses, and to study fundamental aspects .Experiments were conducted in a short-duration transonic wind tunnel which can model realistic engine aerodynamic conditions and adjust inlet Reynolds number and exit Mach number independently.

The surface film cooling measurements were made at the midspan of the blade using thermocouples based on transient heat transfer measurement method.