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Technical Briefs

Transient Temperature Data Analysis for a Supersonic Flight Test

[+] Author and Article Information
Niranjan Sahoo

Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Indiashock@iitg.ernet.in

Ravi Kumar Peetala

Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Indiaravi_peetala@yahoo.co.in

J. Heat Transfer 132(8), 084503 (Jun 09, 2010) (5 pages) doi:10.1115/1.4001128 History: Received October 26, 2009; Revised January 07, 2010; Published June 09, 2010; Online June 09, 2010

Determination of transient surface heat flux from the temperature data is one of the traditional techniques applied in many engineering applications. With respect to high speed flight experiments, the time scale of measured temperature data is usually very small (ms). So, one-dimensional heat conduction analysis is expensively used to infer surface heating rates on the body. For an analytical modeling, it is necessary to obtain a closed form solution from experimentally measured temperature data. In this paper, a temperature data obtained from a nickel film sensor during a supersonic flight test is considered for analysis. Three different curve fitting techniques are used to recover the temperature history of real time flight, namely, piecewise linear fit, polynomial fitting, and cubic-spline method. A one-dimensional transient heat transfer modeling is used to infer surface heating rates from the closed form temperature solutions. Results obtained from these analysis are compared and it is seen that peak surface heat flux values match very closely for polynomial and cubic-spline fitting of temperature data. But, the piecewise linear fit of temperature data underpredicts the peak surface heat flux value by four times from its counterparts.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic representation of one-dimensional heat conduction model

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Figure 2

Supersonic flight data: (a) Mach number history; (b) temperature history

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Figure 3

One-dimensional heat conduction analysis: (a) semi-infinite body, (b) thin film approximation, and (c) inverse analysis

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Figure 4

Comparison of temperature history

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Figure 5

Comparison of transient surface heat flux: (a) time scale=10 s; (b) time scale=1 s

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Figure 6

Inverse analysis and thin film approach for transient surface heat flux: (a) time scale=10 s; (b) time scale=1 s

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