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Catalytic Combustion in Low Temperature Supersonic Mixing Layer on Scramjet Engine Model

超燃冲压发动机模型低温超音速混合层催化燃烧

基本信息

批准号：
09651006
负责人：
ARAI Takakge
金额：
$ 2.5万
依托单位：
MURORAN INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09651006/
关键词：
Scramjet Engine Supersonic Combustion Supersonic Mixing Catalytic Combustion Turbulent Mixing Measurement

项目摘要

It is important for scramjet engine study to understand the mixing process in supersonic mixing layer. So far, many experimental and numerical studies have been conducted to clarify the mixing process in supersonic mixing layer. Most of experimental studies have focused in the velocity distributions concerned with mixing layer, and also evaluated the flow visualization results. Meanwhile, with CPD developing, numerical results have been able to give the spatial data of equivalence ratio of H_2 (distribution of H_2 concentration). There is less data of distribution of equivalence ratio in mixing layer as reason for the difficulty of measuring it. This study proposes a new evaluation technique for the mixing condition of H_2 in hydrogen-air supersonic flow. We have reported the new technique for the evaluation of turbulent supersonic mixing layer using catalytic reaction on constant high temperature Pt wire. This technique has been developed and is applied to measure H_2 concentration in … More supersonic mixing flow produced by inclined hydrogen injection into a Supersonic flow.Hydrogen was injected normally to a Mach 1.8 cold air stream with a backward-facing step to investigate mixing flow field in a scramjet combustor. Catalytic reaction on constant temperature Pt wire was used to measure the mixing condition of H_2 and O_2. It was new technique to investigate H_2 mixing condition. The amount of heat release due to the catalytic reaction, which corresponds to the concentration of H_2 and/or O_2 on the surface of the catalyst, was measured spatially so that the local mixing condition of H_2 and O_2 was cleared. The results showed that there were two core regions. which would have good mixing condition for supersonic combustion, in the mixing layer. The development of core regions along flow direction was also clarified It was also clarified that the new teclmique proposed in the present study was very useful and easy to evaluate the hydrogen concentration in supersonic mixing flow field. Less

超声速混合层中的混合过程对超燃冲压发动机的研究具有重要意义。到目前为止，为了弄清超声速混合层中的混合过程，已经进行了大量的实验和数值研究。大部分的实验研究都集中在与混合层有关的速度分布上，并对流动显示结果进行了评价。同时，随着CPD的发展，数值计算结果已经能够给出H_2当量比（H_2浓度分布）的空间数据。由于混合层当量比分布数据较少，测量困难，本文提出了一种新的评价H_2在氢-空气超声速流中混合状况的方法。本文报道了利用铂丝催化反应评价湍流超声速混合层的新技术。该技术已成功地应用于氢气浓度的测量， ...更多信息为了研究氢在超燃冲压发动机燃烧室中的混合流场，将氢垂直喷入马赫数为1.8的冷空气流中，并在燃烧室中设置一个后台阶。用恒温铂丝催化反应测定了H_2和O_2的混合情况。这是研究H_2混合条件的新技术。在空间上测量了催化反应放热量，即催化剂表面H_2和/或O_2浓度，从而明确了H_2和O_2的局部混合情况。结果表明，该地区存在两个核心区。其在混合层中具有用于超音速燃烧的良好混合条件。还阐明了核心区沿着流动方向的发展。同时阐明了本研究提出的新技术对超声速混合流场中氢浓度的评估是非常有用和容易的。少