A Study on Detonation Driven High Enthalpy Expansion Tube for Hyperbolic Orbital Velocity

在执行样品返回任务的航天器的大气再入大气层或各种探测器进入行星的过程中，航天器都会受到极其严重的气动加热。进入航天器的马赫数大于20，激波后温度超过10000度，空气被解离和电离，需要研究航天器周围的化学和热非平衡流动。为了进行这种高焓流动的研究，有必要建立地面试验装置。本研究的目的是探索建立高焓流动试验装置的可能性和条件，并建立这样的试验装置。在本研究中，提出了一种新型的试验装置。用爆轰产生的高压高温气体作为激波管的驱动气体。激波管旁边安装了一个加速管，以将高速气流加速到超轨道速度。由于提议的测试FA…更多的飞行器没有流动停滞条件，可以通过流动加速来实现超轨道速度，该试验装置可以产生不解离和电离的超高速流动。在本研究中，进行了以下研究：1)对膨胀管的特性进行了研究和精心设计。爆震管的最大激波马赫数为34.5，估算的气流速度为9.8公里/S，属超高速。带起爆管的爆轰管是用来产生高压高温气体的。氢气和氧气的化学计量混合气体用于测试气体。3)为了获得较高的激波马赫数，制作了爆轰管与起爆管和激波管的组合。该组合试验装置可以产生7.4的激波马赫数，该激波马赫数有可能提高爆震管中氢气和氧气化学计量混合气体的初始压力。较少

On the atmospheric reentry of spacecraft of sample return mission or planet entry of various probes, extremely severe aerodynamic heating to the spacecraft occur. The incoming Mach number to the spacecraft is more than 20 and temperature behind shock wave is over 10,000 degrees, In this conditions air is dissociated and ionized and chemically and thermally non-equilibrium flows around the spacecraft should be investigated. For the study of such high enthalpy flow experimental facility of the ground testing are necessary.The purpose of the present study is to survey the possibility and conditions of high enthalpy flow test facility and build such a test facility. In the present study a new type of test facility is proposed. The high pressure and high temperature gas, which is produced with detonation, is used as driver gas of shock tube. Next to the shock tube a acceleration tube is attached in order to accelerate the high speed flow to hyper-orbital velocity. Since the proposed test fa … More cility has no flow stagnation condition and hyper-orbital velocity can be realized by flow acceleration, the test facility could produce hyper-velocity flow without dissociation and ionization. In the present studies the following studies have been conducted.1) Characteristics of expansion tube are investigated and carefully designed. The expansion tube succeeded to produce maximum shock Mach number of 34.5 and estimated flow velocity is 9.8 km/s, which is hyper-velocity.2) Characteristics of detonation tube is investigated and carefully designed. The detonation tube with initiation tube is used in order to produce high pressure and high temperature gas. The stoichiometric mixture of hydrogen gas and oxygen gas is used for the testing gas. The detonation tube tube with initiation tube could produce Chapman-Jouget detonation yelocity.3) The combination of the detonation tube with initiation tube and shock tube are produced and tested in order to obtain high shock Mach number. The combination test facility could produce shock Mach number of 7.4 and this shock Mach number is possible to increase the initial pressure of stoichiometric mixture of hydrogen gas and oxygen gas of detonation tube. Less