Results from on-board CSA-CP and CDM Sensor Readings during the Burning and Suppression of Solids – II (BASS-II) Experiment in the Microgravity Science Glovebox (MSG)
Results from on-board CSA-CP and CDM Sensor Readings during the Burning and Suppression of Solids – II (BASS-II) Experiment in the Microgravity Science Glovebox (MSG)
复制标题
微重力科学手套箱 (MSG) 中固体燃烧和抑制 – II (BASS-II) 实验期间机载 CSA-CP 和 CDM 传感器读数的结果
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
I. Wichman
中科院分区：
文献类型：
--
作者：
S. Olson;P. Ferkul;S. Bhattacharjee;F. Miller;C. Fernandez;Shmuel Link;J. Tien;I. Wichman
在国际空间站上，BASS-II首次使用了MSG工作体积稀释的气态氮（N2）。我们开发了一个完全搅拌的反应器模型来确定N2流动时间和流速，以获得每个测试的工作体积中所需的还原氧浓度。我们使用质量成分分析仪阅读的国际空间站当天的环境大气数据，用CSA-CP氧气读数偏移校准了模型。这对操作非常有效，并为我们的测试矩阵增加了一个新的重要变量，环境氧气水平。在BASS-II中测试的主要变量是环境氧浓度、通风流速和燃料类型、厚度和几何形状。BASS-II还利用机载CSA-CP测量氧气和一氧化碳读数，并利用CDM测量每次测试前后的二氧化碳读数。这些传感器的读数使我们能够评估燃烧的完整性。分析每次测试前后的氧气和二氧化碳读数，并与一步气相反应的化学计量比进行很好的比较。对于某些数据集，CO对CO2遵循线性趋势，但对于所测试的燃料和流量的所有不同几何形状并非如此。最后，我们使用每克消耗的氧气释放的恒定的13.1 kJ热量，从氧气消耗和燃烧时间计算每个测试期间的热释放速率。结果显示，大多数测试的热释放率远低于100瓦。
For the first time on ISS, BASS-II utilized MSG working volume dilution with gaseous nitrogen (N2). We developed a perfectly stirred reactor model to determine the N2 flow time and flow rate to obtain the desired reduced oxygen concentration in the working volume for each test. We calibrated the model with CSA-CP oxygen readings offset using the Mass Constituents Analyzer reading of the ISS ambient atmosphere data for that day. This worked out extremely well for operations, and added a new vital variable, ambient oxygen level, to our test matrices. The main variables tested in BASS-II were ambient oxygen concentration, ventilation flow velocity, and fuel type, thickness, and geometry. BASS-II also utilized the on-board CSA-CP for oxygen and carbon monoxide readings, and the CDM for carbon dioxide readings before and after each test. Readings from these sensors allow us to evaluate the completeness of the combustion. The oxygen and carbon dioxide readings before and after each test were analyzed and compared very well to stoichiometric ratios for a one step gas-phase reaction. The CO versus CO2 followed a linear trend for some datasets, but not for all the different geometries of fuel and flow tested. Lastly, we calculated the heat release rates during each test from the oxygen consumption and burn times, using the constant 13.1 kJ of heat released per gram of oxygen consumed. The results showed that the majority of the tests had heat release rates well below 100 Watts.