Supercritical carbon dioxide as a new working medium for pneumatic launch:A theoretical study

作     者：Hong-xin Yao Xue-zhong Wei Hong Ye Hong-xin Yao;Xue-zhong Wei;Hong Ye

作者机构：Department of Thermal Science and Energy EngineeringUniversity of Science and Technology of ChinaHefei230027People’s Republic of China 

出 版 物：《Defence Technology（防务技术）》 (Defence Technology)

年 卷 期：2021年第17卷第4期

页      面：1296-1306页

核心收录：

学科分类：08[工学] 082503[工学-航空宇航制造工程] 0824[工学-船舶与海洋工程] 0825[工学-航空宇航科学与技术] 082401[工学-船舶与海洋结构物设计制造] 

基　　金：This work was funded by the National Natural Science Foundation of China(No.51576188) 

主　　题：Pneumatic launch Supercritical carbon dioxide Restrictive relation of the launch readiness state Optimal launch readiness state High working capacity 

摘      要：Compared with the conventionally gaseous or liquid working media,the specific internal energy of supercritical carbon dioxide(SCD)is higher at the same temperature and pressure,and the critical temperature of carbon dioxide is close to room temperature,making SCD a potential new working medium for pneumatic *** analyze the feasibility of this conception,an analytical model of a pneumatic catapult is established on basis of the conservations of mass and *** model consists of a high-pressure chamber and a low-pressure chamber connected by multiple valves,and there is a movable piston in the low-pressure chamber that can push an aircraft to *** effects of the launch readiness state of SCD in the high-pressure chamber,the initial volume of the low-pressure chamber and the valve control on the movement of the aircraft are *** is found that there is a restrictive relation between the temperature and pressure of the launch readiness state of SCD,i.e.,there is a maximum allowable launch readiness pressure when the launch readiness temperature is *** this restrictive relation is not satisfied,the working medium in the low-pressure chamber will drop to its triple point within a few milliseconds,leading to a launch *** to this restrictive relation,there is an optimal launch readiness state of SCD with the highest working capacity for any allowable launch readiness *** pressure of the low-pressure chamber will decrease significantly as the initial volume increases,leading to a decreased acceleration of the *** acceleration can be controlled below a critical value by a designed sequential blasting technique of multiple *** calculated results show that a 500 kg aircraft can be accelerated from 0 to 58 m/s in 0.9 s with 36 kg of carbon *** research provides a new technique for the controllable cold launch of an aircraft.