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首页> 外文会议>International Symposium and Exhibition on Sophisticated Car Occupant Safety Systems; 20021202-04; Karlsruhe(DE) >VELOCITY AND TEMPERATURE MEASUREMENTS ON GAS GENERATORS
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VELOCITY AND TEMPERATURE MEASUREMENTS ON GAS GENERATORS

机译：气体发生器的速度和温度测量

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Gas velocity and temperature were measured probing the discharge holes of a gas generator with high temporal resolution (sub-ms). The pressure history was additionally recorded at a further discharge hole, in order to derive mass and energy efflux needed for the numerical simulation of airbag-inflation behaviour. Also the discharge of the gases was visualized using a high-speed camera to provide view on its temporal evolution.Time resolved temperature measurements were carried out by means of the well known method of emission-absorption spectroscopic method [1]. Gas temperature could only be measured spectroscopically 5 ms after ignition for values above 550 K, due to the low emission intensity and low absorptance of the gases, especially at the selected observation wavelength (2.7 μm). The temperature rises to a maximum after about 30 ms attaining values above 800 K and then decays. For times t ＞ 50 ms it cannot be measured any more, because the temperature drops down below the measurement limit of 650 K.The velocity of flow-borne particles were obtained by means of a laser-Doppler velocimeter invented by SMEETS [2]. The observed steep fall and rise of the gas velocity (maximum 1000 m/s) was explained by the motion of an inner shock font - the so called Mach-disc - when it passes the point of measurement.Further research plans to extend the spectral range of the emission-absorption method to the far IR at observation wavelengths of 8 - 14 μm. Then temperature measurements down to 200 K (room temperature or even below) with high temporal resolution (＞ 1 μs) becomes feasable.
机译：测量气体速度和温度，探测具有高时间分辨率（sub-ms）的气体发生器的排气孔。为了获得安全气囊充气行为数值模拟所需的质量和能量外泄，还另外在另一个排气孔处记录了压力历史。气体的排放也可以通过高速摄像机观察，以观察其随时间的变化。时间分辨的温度测量是通过众所周知的发射吸收光谱法进行的[1]。对于550 K以上的值，只能在点燃后5毫秒以光谱法测量气体温度，这是由于气体的低发射强度和低吸收率，特别是在选定的观察波长（2.7μm）下。温度在大约30毫秒后达到800 K以上的值后升高到最大值，然后下降。对于t＞ 50 ms的时间，由于温度降到了650 K的测量极限以下，因此无法再进行测量。通过SMEETS发明的激光多普勒测速仪获得了流动颗粒的速度[2]。观察到的气体速度的急剧下降和上升（最大1000 m / s）可以通过内部冲击字体-所谓的Mach圆盘-通过测量点时的运动来解释。进一步的研究计划扩展光谱发射吸收法在观察波长为8-14μm的远红外范围内。然后，可以进行高分辨率（> 1μs）的低至200 K（室温或更低温度）的温度测量。

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