Scaling laws for scramjets : an experimental and theoretical investigation to determine the scaling laws for scramjet engine performance at hypersonic flight conditions

1997 ◽  
Author(s):  
Maria V Pulsonetti
Keyword(s):  
Theoretical Investigation ◽  
Scaling Laws ◽  
Engine Performance ◽  
Hypersonic Flight ◽  
Scramjet Engine

scholarly journals Scramjet Engine Performance Attained in RJTF Testing

2004 ◽  
Vol 52 (600) ◽  
pp. 1-9 ◽  
Author(s):  
Tohru Mitani ◽  
Sadatake Tomioka ◽  
Takeshi Kanda ◽  
Koichiro Tani ◽  
Nobuo Chinzei ◽  
...  
Keyword(s):  
Engine Performance ◽  
Scramjet Engine

Micro Thermal Engines: Is There Any Room at the Bottom?

1999 ◽  
Author(s):  
Richard B. Peterson
Keyword(s):  
Heat Transfer ◽  
Scaling Laws ◽  
Critical Role ◽  
Heat Engine ◽  
Engine Performance ◽  
Characteristic Size ◽  
Operating Efficiency ◽  
Simple Scaling ◽  
Small Structure ◽  
Micro Heat Engine

Abstract Richard P. Feynman introduced the field of microscale and nanoscale engineering in 1959 by giving a talk on how to make things very small. Feynman’s premise was that no fundamental physical laws limit the size of a machine down to the microscopic level. Is this true for all types of machines? Are micro thermal devices fundamentally different than mechanically-based machines with respect to their scaling laws? This paper demonstrates that micro thermal engines do indeed suffer serious performance degradation as their characteristic size is reduced. A micro thermal engine, and more generally, any thermally-based micro device, depends on establishing a temperature difference between two regions within a small structure. In this paper, the performance of a micro thermal engine is explored as a function of the characteristic length parameter, L. In the development, the important features of thermal engines are discussed in the context of developing simple scaling laws predicting the dependency of the operating efficiency on L. After this is accomplished, a general model is derived for a heat engine operating between two temperature reservoirs and having both intrinsic and extrinsic sources of irreversibility, i.e. thermal conductances and heat leakage paths for the heat flow. With this model and typical numerical values for the conductances, micro heat engine performance is predicted as the characteristic size is reduced. This paper demonstrates that under at least one particular formulation of the problem, there may indeed be some room at the bottom. However, heat transfer does play a critical role in determining micro engine performance and depending on how the heat transfer through the engine is modeled, vanishingly small efficiencies can result as the characteristic engine size goes to zero.

Influence of Different Fuels on Scramjet Engine Performance

2019 ◽  
Author(s):  
Wang Zhi-hua ◽  
Chen Yu-chun ◽  
Wang Xiao-dong ◽  
Chen Min-ze ◽  
Zhou Jun-hui ◽  
...  
Keyword(s):  
Engine Performance ◽  
Scramjet Engine

Measurements of scramjet engine performance by gas sampling

1998 ◽  
Author(s):  
Tohru Mitani ◽  
Masahiro Takahashi ◽  
Sadatake Tomioka ◽  
Tetsuo Hiraiwa ◽  
Kouichiro Tani
Keyword(s):  
Engine Performance ◽  
Gas Sampling ◽  
Scramjet Engine

Effect of Sides-Spillage from Airframe on Scramjet Engine Performance

2001 ◽  
Vol 17 (1) ◽  
pp. 139-145 ◽  
Author(s):  
Kouichiro Tani ◽  
Takeshi Kanda ◽  
Kenji Kudo ◽  
Daisuke Akihisa
Keyword(s):  
Engine Performance ◽  
Scramjet Engine

Trial for Improvement in Scramjet Engine Performance

2018 ◽  
Author(s):  
Shigeru Sato ◽  
Masaaki Fukui ◽  
Takahiro Watanabe ◽  
Masaharu Takahashi ◽  
Toshihiko Munakata
Keyword(s):  
Engine Performance ◽  
Scramjet Engine

Vitiation Effects on Scramjet Engine Performance in Mach 6 Flight Conditions

2007 ◽  
Vol 23 (4) ◽  
pp. 789-796 ◽  
Author(s):  
Sadatake Tomioka ◽  
Tetsuo Hiraiwa ◽  
Kan Kobayashi ◽  
Muneo Izumikawa ◽  
Tomoyuki Kishida ◽  
...  
Keyword(s):  
Engine Performance ◽  
Scramjet Engine
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