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Scaling of heat transfer in gas–gas injector combustor |
Wang Xiao-Wei(汪小卫), Cai Guo-Biao(蔡国飙)†, and Gao Yu-Shan(高玉闪) |
School of Astronautics, Beihang University, Beijing 100191, China |
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Abstract The scaling of heat transfer in gas–gas injector combustor is investigated theoretically, numerically and experimentally based on the previous study on the scaling of gas–gas combustion flowfield. The similarity condition of the gas–gas injector combustor heat transfer is obtained by conducting a formulation analysis of the boundary layer Navier–Stokes equations and a dimensional analysis of the corresponding heat transfer phenomenon. Then, a practicable engineering scaling criterion of the gas–gas injector combustor heat transfer is put forward. The criterion implies that when the similarity conditions of inner flowfield are satisfied, the size and the pressure of gas–gas combustion chamber can be changed, while the heat transfer can still be qualitatively similar to the distribution trend and quantitatively correlates well with the size and pressure as q ∝ pc0.8dt-0.2 . Based on the criterion, single-element injector chambers with different geometric sizes and at different chamber pressures ranging from 1 MPa to 20 MPa are numerically simulated. A single-element injector chamber is designed and hot-fire tested at seven chamber pressures from 0.92 MPa to 6.1 MPa. The inner wall heat flux are obtained and analysed. The numerical and experimental results both verified the scaling criterion in gas–gas injector combustion chambers under different chamber pressures and geometries.
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Received: 16 December 2010
Revised: 11 January 2011
Accepted manuscript online:
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PACS:
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47.70.-n
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(Reactive and radiative flows)
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44.90.+c
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(Other topics in heat transfer)
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47.27.te
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(Turbulent convective heat transfer)
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Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2008AA7023) and the Innovation Foundation of Beihang University for Ph. D. Graduates (Grant No. 430569). |
Cite this article:
Wang Xiao-Wei(汪小卫), Cai Guo-Biao(蔡国飙), and Gao Yu-Shan(高玉闪) Scaling of heat transfer in gas–gas injector combustor 2011 Chin. Phys. B 20 064701
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