AIAA-2015-3867 Effect of Water and Humidity on Hypergolic Propellant Ignition Delay
Figure 7. Microphone (a, photodiode (b, NH (c, and OH (d) data from the same case #1 test. The vertical red line on (a) and (b) represents the end of the streak data inc) and (db i. Aged TEAB Trends The samples from three different aging environments are considered humid air, dry air, and dry nitrogen. For the two humid air samples, it was difficult to draw in fuel into the 100 l syringe without pulling in air or clogging the needle. This issue was not experienced with any other fuel used with the same syringe. All of these samples are tested with neat WFNA and a low RH environment and compared to tests done at the same conditions with neat TEAB extracted from the bottle on the day of testing. For the humid air samples, linear regression analysis suggests that the video IDT, the onset of OH and NH, the photodiode maximum voltage, and microphone max amplitude are not affected by the propellant age. The photodiode diode shows a slight trend of -day (p-value = 0.19). Although the photodiode and microphone amplitudes show no change with age, the maximum magnitude of the OH signal is clearly affected by the propellant age as shown in Figure 8. Downloaded by PURDUE UNIVERSITY on July 21, 2017 | http://arc.aiaa.org | DOI: 10.2514/6.2015-3867
