【摘要】：微推力器是微納衛(wèi)星姿態(tài)控制、軌道保持和機(jī)動的重要元件。微納衛(wèi)星的快速發(fā)展,對微推進(jìn)系統(tǒng)提出了很高的要求。針對激光燒蝕微推力器,本文的主要工作如下：(1)為了精確測量激光燒蝕微推力器產(chǎn)生的沖量,基于扭擺測試沖量的原理,建立了微沖量測試平臺,分析了阻尼對測試結(jié)果的影響。研究結(jié)果表明推力測試平臺的分辨率為4.1×10-7N.s,可以實(shí)現(xiàn)4.1×10-7N.s-4.45×10-3N.s范圍內(nèi)的沖量測試。空氣和外接線路引入的阻尼為10-3量級,引起的測量誤差小于1%。(2)設(shè)計了基于透射模式的激光燒蝕微推力測試樣機(jī)。該樣機(jī)使用功率較小的半導(dǎo)體激光器為光源,使用具有聚焦功能的光纖耦合輸出激光,作用于燒蝕材料的有效功率密度為1.27×104W/cm2。對以含能聚合物疊氮縮水甘油醚(GAP)作為燒蝕材料制作的靶帶進(jìn)行了靜態(tài)標(biāo)定,實(shí)驗(yàn)得到燒蝕層厚度為170μmm的靶帶的最高比沖為104s,最高沖量耦合系數(shù)為2471μN(yùn)/W。(3)獲得了錐形噴口和直壁型兩種噴口對沖量的影響規(guī)律。研究結(jié)果表明使用錐形噴口會使得沖量急劇減小。直壁型噴口由于可以有效地約束氣體產(chǎn)物,因此可以有效地增大比沖。內(nèi)徑1mm、長度6mm的直壁型噴口使得沖量最多增大了25.0%。由于濺射產(chǎn)物顆粒較大,納米鋁粉的加入會明顯減小比沖,最多減小了47.4%。
[Abstract]:Micro-thruster is an important component in attitude control, orbit keeping and maneuver of micro-nano satellite. With the rapid development of micro-and nano-satellites, the requirement of micro-propulsion system is very high. The main work of this paper is as follows: (1) in order to accurately measure the impulse produced by laser ablation micro-thruster, based on the principle of torsion pendulum testing impulse, a micro-impulse measurement platform is established. The influence of damping on the test results is analyzed. The results show that the resolution of the thrust test platform is 4.1 脳 10 ~ (-7) N.s, and the impulse measurement can be realized in the range of 4.1 脳 10-7N.s-4.45 脳 10-3N.s. The damping introduced by air and external circuits is of order of 10 ~ (-3), and the measurement error is less than 1. (2) A laser ablation micro-thrust test prototype based on transmission mode is designed. The semiconductor laser with low power is used as the light source and the fiber coupling output laser with focusing function is used. The effective power density of the ablative material is 1.27 脳 10 ~ 4 W / cm ~ (2). The effective power density of the laser is 1.27 脳 10 ~ (4) W / cm ~ (2). The static calibration of targets made of energetic polymer glycidyl azide (GAP) as ablative material was carried out. The experimental results show that the maximum specific impulse and the maximum impulse coupling coefficient of the target band with the thickness of 170 渭 mm are 104 s and 2471 渭 N / W (3) respectively. The results show that the use of a conical nozzle can dramatically reduce the impulse. The straight wall nozzle can effectively increase the specific impulse because it can restrain the gas product effectively. A straight wall nozzle with an inner diameter of 1 mm and a length of 6mm increases the impulse by up to 25.0. Due to the large size of the sputtering product, the specific impulse of the nano-aluminum powder is obviously reduced, and the maximum reduction is 47.4%.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN249

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本文編號：2261445