85%H_2O_2的催化分解性能试验

高浓度过氧化氢是一种理想的绿色氧化剂,近年来在航天领域受到了广泛的重视.它的分解速度直接影响固液火箭发动机的各项性能,因此,过氧化氢的催化分解研究是固液火箭发动机研究的重要一环.文章主要针对85%过氧化氢-低密度聚乙烯固液火箭发动机氧化剂过氧化氢催化剂的催化分解进行了研究,并通过固液发动机试验结果,从理论上分析了影响过氧化氢分解效率的因素.结果表明,200目镀银镍网具有良好的催化能力,在镀银镍丝催化网涂覆适当的添加剂可以迅速分解过氧化氢,用85%过氧化氢对镀银镍网进行预处理可提高催化剂的初始启动性能,改进氧化剂喷嘴的结构设计可减少催化网的"通道效应"并减善过氧化氢积存状况.

Experiments on catalytic decomposition property of 85% hydrogen peroxide

High concentration hydrogen peroxide is an ideal candidate for "green propellent" and is widely regarded in spaceflight field. Its decomposition speed directly affects the performance of hybrid rocket motor (HRM). Therefore, studying its catalyzed decomposition proves to be one of the most important steps for the research of HRM. This paper mainly investigates the catalyzed decompo-sition of the catalyst of hydogen peroxide used in the 85% hydrogen peroxide-low density polyethy-lene HRM. Based on the test results of HRM, the paper also makes an theoretical analysis of the factors influencing catalytic rate. It is shown that silver-plated nickel networks with mesh 200 have good catalytic activity. 85% hydrogen peroxide is quickly decomposed by means of additives coating on the network surface. At the same time, transient performance of catalyst is improved by prepro-cessing silver-plated nickel network. Channel effect and accumulation of H_2O_2 can be reduced by improving structure designing of oxidizer injector.