Effects of hydrogen-air non-equilibrium chemistry on the performance of a model scramjet thrust nozzle

Stalker, R. J., Truong, N. K., Morgan, R. G. and Paull, A. (2004) Effects of hydrogen-air non-equilibrium chemistry on the performance of a model scramjet thrust nozzle. Aeronautical Journal, 108 November: 575-584.


Author Stalker, R. J.
Truong, N. K.
Morgan, R. G.
Paull, A.
Title Effects of hydrogen-air non-equilibrium chemistry on the performance of a model scramjet thrust nozzle
Journal name Aeronautical Journal   Check publisher's open access policy
ISSN 0001-9240
Publication date 2004
Sub-type Article (original research)
Volume 108
Issue November
Start page 575
End page 584
Total pages 10
Editor J. L. Stollery
C. S. Male
Place of publication England
Publisher Royal Aeronautical Society
Collection year 2004
Language eng
Subject C1
290299 Aerospace Engineering not elsewhere classified
690302 Space transport
Abstract Two aspects of hydrogen-air non-equilibrium chemistry related to scramjets are nozzle freezing and a process called 'kinetic afterburning' which involves continuation of combustion after expansion in the nozzle. These effects were investigated numerically and experimentally with a model scramjet combustion chamber and thrust nozzle combination. The overall model length was 0.5m, while precombustion Mach numbers of 3.1 +/- 0.3 and precombustion temperatures ranging from 740K to 1,400K were involved. Nozzle freezing was investigated at precombustion pressures of 190kPa and higher, and it was found that the nozzle thrusts were within 6% of values obtained from finite rate numerical calculations, which were within 7% of equilibrium calculations. When precombustion pressures of 70kPa or less were used, kinetic afterburning was found to be partly responsible for thrust production, in both the numerical calculations and the experiments. Kinetic afterburning offers a means of extending the operating Mach number range of a fixed geometry scramjet.
Keyword Engineering, Aerospace
Shock Tunnel
Propulsion
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 04:07:05 EST