液滴ラジエータ用均一液滴流の生成

抄録

The liquid droplet radiator (LDR) uses many streams of droplets to radiate heat to space. A droplet emitter of the liquid droplet radiator produces directed droplets streams from its orifices toward a droplet collector. During the flight, droplets loses heat by radiation. In order to constitute an effectivelly radiative droplet sheat and minimize the working fluid loss at the collector, uniformly formed and spaced droplet streams with a good aiming accuracy are required to be formed. To investigate the formation of such a uniform droplet stream, and develop the droplet emitter, a laboratory model with a single orifice was made. Diffusion pump oil (DC-704) was used as a working fluid, and squirted out from the orifice by applying pressure. In addition, pressure perturbation was caused by the piezoelectric ceramic to produce uniform droplets from the liquid jet coming out from the orifice. The formation characteristics of the liquid droplet stream was tested in a vacuum, and it was confirmed the liquid droplet stream thus produced reached the required level for the liquid droplet radiator.