航空发动机在高空台上的H0/Ma0试验分析

分析了发动机高空台H0/Ma0试验时,高空舱压力与标准大气压力不一致的产生原因,以及由于发动机排气引射作用与高空舱内冷却流动造成的环境压力低于标准大气海平面静止空气压力对发动机H0/Ma0试验结果的影响机理。在此基础上,提出了环境压力差异对发动机H0/Ma0试验结果影响的研究方案,并用两型发动机在不同试车台上进行了H0/Ma0试验与研究性试验。结果表明,70 kPa压力环境、0.99~1.02冲压比的高空台H0/Ma0试验的换算结果,与标准大气海平面静止条件下的试验结果基本一致。     

高空台加温试验进气管网传热过程的计算分析

分析了高空台加温试验时管网内部流动的动态换热特性,建立了管内气体和管壁的联合换热方程,在与试验数据对比的基础上提出了数学模型的修正方法,对试验中管网出口温升过程进行了计算,取得了较好效果。计算结果分析表明:局部热损失在管网散热过程中的比重较大,为缩短试验准备时间,应对混和器出口温度进行分段控制。     

基于试验的高空台混合器至流量管传热模型研究

基于高空台升温试验原理和已有试验数据,对影响升温过程的因素进行了分析,得出混合器出口温度值的高低是影响升温速率的主要因素。同时,采用基于试验数据的建模方法,将经验值转化为数学模型,实现了高空台升温过程的数值模拟。     

燃油降温系统的设计和研制

简要介绍了高空台燃油降温系统的用途、设计方案、设计技术要求、工作原理、主要设备和调试结果。     

高空台空气降温条件的技术改造

介绍了高空台空气降温系统技术改造的必要性和改造的原则，简要叙述了技改后的高空台空气降温系统工艺方案和工艺流程；并对技改前后的高空台空气降温系统的设备和性能进行了对比。     

国外火箭发动机试车台及发展趋势

综述了美国、德国、法国和日本的火箭发动机机构和试验装置,概括了火箭推进试验技术的发展趋势,指出了我国与航天技术发达国家在硬件装备、试验能力及技术水平方面存在的差距。     

A numerical optimization of high altitude testing facility for wind tunnel experiments

High altitude test facilities are required to test the high area ratio nozzles operating at the upper stages of rocket in the nozzle full flow conditions.It is typically achieved by creating the ambient pressure equal or less than the nozzle exit pressure.On average,air/GN2is used as active gas for ejector system that is stored in the high pressure cylinders.The wind tunnel facilities are used for conducting aerodynamic simulation experiments at/under various flow velocities and operating conditions.However,constructing both of these facilities require more laboratory space and expensive instruments.Because of this demerit,a novel scheme is implemented for conducting wind tunnel experiments by using the existing infrastructure available in the high altitude testing(HAT)facility.This article presents the details about the methods implemented for suitably modifying the sub-scale HAT facility to conduct wind tunnel experiments.Hence,the design of nozzle for required area ratio A/A*,realization of test section and the optimized configuration are focused in the present analysis.Specific insights into various rocket models including high thrust cryogenic engines and their holding mechanisms to conduct wind tunnel experiments in the HAT facility are analyzed.A detailed CFD analysis is done to propose this conversion without affecting the existing functional requirements of the HAT facility.     

主动引射高模试车台水喷雾冷却器等效热力系统模型的研究

水喷雾冷却器在主动引射高空模拟试车台中具有重要作用,其出口处温度的有效控制是保障试车正常运行的关键。针对某型号火箭发动机常压试验的喷雾冷却器,建立了等效热力系统模型,并在Simulink平台上建立了相应的动态仿真模型,计算结果与试车测试结果对比证明所建等效热力系统模型正确,从而为实现其出口处温度的有效控制提供依据。     

R3D-B2 – Measurement of ionizing and solar radiation in open space in the BIOPAN 5 facility outside the FOTON M2 satellite

Solar and space radiation have been monitored using the R3D-B2 radiation risks radiometer-dosimeter on board a recent space flight on the Russian satellite Foton M2 within the ESA Biopan 5 facility mounted on the outside of the satellite exposed to space conditions. The solar radiation has been assayed in four wavelength bands (UV-C, 170–280 nm, UV-B, 280–315 nm), UV-A (315–400 nm) and PAR (photosynthetic active radiation, 400–700 nm). The data show an increasing tumbling rotation of the satellite during the mission. The photodiodes do not show a cosine response to the incident light which has been corrected. After calibration of the signals using the extraterrestrial spectrum, doses have been calculated for each orbit, for each day and for the total mission as basic data for the biological material which has been exposed in parallel in the Biopan facility. Cosmic ionizing radiation has been monitored and separated in 256 deposited energy spectra, which were further used for determination of the absorbed dose rate and flux. Basic data tables were prepared to be used by other Biopan 5 experiments. The paper summarizes the results for the Earth radiation environment at the altitude (262–304 km) of the Foton M2 spacecraft. Comparisons with the predictions of NASA Earth radiation environment experimental models AE-8 and AP-8, and the PSB97 model are also presented, which calculate the fluxes of ionizing radiation from a simulation. AP-8 is a model for trapped radiation.     

现场校准试验用便携式γ射线照射装置研制

固定式环境γ辐射剂量率监测仪表是承担环境连续监测任务的主要设备,这类仪表通常不便于拆卸和安装,而且送检周期较长（一周左右）,影响了连续监测点数据的连续性。为了固定式仪表的按期校准,结合蒙卡方法研制了便携式γ射线照射装置,利用PTW剂量计对辐射场进行标定,最后利用便携式照射装置对固定式环境γ辐射剂量率监测仪表进行现场校准实验。