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首页> 外文期刊>Combustion Science and Technology >CRITICAL TUBE MEASUREMENTS AT ELEVATED INITIAL MIXTURE TEMPERATURES
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CRITICAL TUBE MEASUREMENTS AT ELEVATED INITIAL MIXTURE TEMPERATURES

机译：初始混合温度下的临界管测量

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摘要

Experimental results obtained on the transmission of a planar detonation wave from a cylindrical tube into an unconfined volume are reported. Experiments are performed using a 9.1 m long tube connected to an 88.9 cm inner diameter receiver vessel. Both the detonation tube and receiver vessel can be heated. Tests are performed using 10, 20, and 27.3 cm tubes. The minimum, or critical, hydrogen concentration in air that results in detonation transmission into the receiver vessel is measured at an initial pressure of 1 atm and initial temperatures of 300, 500, and 650 K. The value of the ratio of the tube diameter, d, and the critical mixture detonation cell size, λ_c, is found to be between 18 and 24. The data show no correlation between the value of d/λ_c and the initial mixture temperature and there is no observable effect of temperature on the regularity of the soot foil line spacing. The uncertainty in the average cell size measurement of +-25% is not sufficient to explain the significant departure from the classical empirical correlation d/λ_c = 13. It is proposed that the d/λ_c = 13 is neither a unique nor adequate correlation for describing detonation diffraction in mixtures considered to have a regular or irregular detonation cellular structure.
机译：报道了将平面爆震波从圆柱管传输到无侧限体积中获得的实验结果。使用连接到内径为88.9 cm的接收容器的9.1 m长的管子进行实验。爆震管和接收容器均可加热。使用10、20和27.3 cm的试管进行测试。在1atm的初始压力和300、500和650 K的初始温度下测量导致爆炸传递到接收容器中的空气中的最小或临界氢浓度。管直径比的值d，临界混合物爆轰孔的大小λ_c在18至24之间。数据显示d /λ_c的值与初始混合物温度之间没有相关性，并且温度对d的规律性没有明显影响。烟灰箔线间距。平均像元大小测量的不确定性为+ -25％，不足以解释与经典经验相关性d /λ_c= 13的显着偏离。建议d /λ_c= 13既不是唯一的也不是足够的相关性描述了在具有规则或不规则爆轰孔结构的混合物中的爆轰衍射。

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