雷射全像干涉術應用於軸－側向進氣燃燒室混合效應之研究

Laser Holographic Interferometry Applied to the Measurments of Fuel-Air Mixing in an Axial/Side Dump Combustor

黃鎮江(J. J. Hwang) ； 鄭藏勝(T. S. Cheng) ； 吳聖俊(S. J. Wu) ； 賴東佑(T. Y. Lai)

《中國航空太空學會學刊》 27卷4期 (1995/12) Pp. 321-328

https://doi.org/10.6124/TAASRC.199512_27(4).05

摘要

本本以雷射全像干涉術研究究具半圓形頂板之突張式燃燒室內，燃料濃度（溫度）分佈之情形，其中側向進氣角度固定爲60度，管道雷諾數則在26700與54400間變化，實驗中以熱空氣模擬燃料、泠空氣模擬氧化劑（空氣），以瞭解燃氣在化學反應前，在燃燒室內的分佈狀況。實驗首先將全像干涉法與傳統熱電偶量測結果相互比較，結果相當吻合；實驗結果亦發現改變雷諾數對燃氣分佈之影響並不明顯，而從中心軸燃氣分佈可明顯地將燃燒室劃分成頂板區，衝擊區以及發展區等三個不同混合程度之區域，其中衝擊區之混合效果最好，發展區混合效果最差。

關鍵字

混合 ； 雷射全像干涉術 ； 濃度

並列摘要

Gas concentration measurements of simulated fuel-air mixing in an axial/side dump combustor were conducted by laser holographic interferometry (LHI) under cold-flow conditions. The modeled combustor chamber consisted of a semicircular dome plate and a combination of an axial and two side inlets. Relative hot-gas was introduced from the axial inlet to simulate the fuel-jet, whereas relative cold-gas was introduced from the two side inlets to simulate the air-jets. The axial-jet impinged on each of the side-jets at the symmetric plane of the combustor with angle of 60 deg. The Reynolds number, based on the combustor hydraulic diameter and mean velocity, was varied from 26700 to 54400. It was found that the LHI measurements were compared well with those by thermocouple probing. Results further showed that the influence of the Reynolds number on the gas concentration distribution is not significant. It was readily devided the gas concentration distribution into three typical regimes, namely, dome, impinging, and developing regimes. The impinging regime gave the best fuel-air mixing, and the developing regime gave the worst fuel-air mixing.

並列關鍵字

Mixing ； Laser holographic interferometry ； Concentration