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沿缩尺寸无喷管发动机药柱通道的几个轴向位置的燃烧速率测量,是通过超声波传感器进行的,传感器可检测推进剂的瞬时肉厚。为此,采用了两种试验装置:装有带金属的复合推进剂的轴对称无喷管发动机和装有不带金属的复合推进剂的二维侧窗无喷管装置。超声波传感器给出发动机增压期间对药柱变形的评估。在这两种装置中,在头端区域内的无横流燃烧速率的测量结果与标准药条一致,在尾部区域存在高侵蚀燃烧速率。在数据表中列举了侵蚀燃烧数据。其中主要试验变量包括:通道半径或宽度,无横流燃烧速率和平均流速。这些试验结果表明,通常见到的临界密流趋势,无横流燃烧速率敏感性和尺寸依赖关系在无喷管发动机中也得到了验证。
Burning rate measurements at several axial positions along the reduced nozzleless nozzle channel are performed by an ultrasonic sensor that detects the instantaneous flesh thickness of the propellant. Two test rigs were used for this purpose: an axisymmetric nozzleless engine with a metal-clad composite propellant and a two-dimensional side-window nozzleless unit with a metal-free composite propellant. Ultrasonic sensors give an estimate of the deformation of the charge during engine boost. In both devices, the measurement of no-cross-flow rate in the head-end region was consistent with the standard dipstick with a high erosion rate of combustion in the aft region. Erosion combustion data are listed in the datasheet. The main test variables include: radius or width of the tunnel, no cross-flow rate and average flow velocity. The results of these tests show that the commonly observed critical dense flow trend without cross-flow burn rate sensitivity and dimensional dependence has also been demonstrated in nozzleless engines.