结构参数对环簇式塞式喷管性能的影响

为研究环簇式塞式喷管设计中人为选择的结构参数对性能的影响,在单元间距与内喷管出口直径比、单元喷管数目、内喷管面积比分别相同的前提下,计算并比较了三种塞式喷管的推力效率.结果表明,高空下内喷管面积比30.2的8单元接触式的效率最高,而低空下内喷管面积比20.7的8单元间隔式的效率最高.因此在总面积比一定的情况下,若塞式喷管在中低空高度下工作,则单元内喷管面积比可取得小些,以保证中低空下的效率;反之,则单元内喷管面积比尽量取得大些.

Effect of configurative parameter on the performance of clustered plug nozzles

In order to investigate effect of the uncertain design parameters on the performance of cluster plug nozzles in design method, two type of 8-module and one type of 16-module clustered plug nozzles were designed with the restriction of the same total area ratio and shape size. Their thrust efficiencies were calculated with numerical method. The thrust efficiencies were compared respectively with the condition of same module gap and diameter ratio, module number and module area ratio. The 8-touched-module clustered plug nozzle with module area ratio of 30.2 had the highest efficiency in high attitude and the 8- separated-module clustered plug nozzle with module area ratio of 20.7 had the highest efficiency in low attitude. In design procedure a bigger module area ratio can be selected to enhance its performance when the clustered nozzle works in medium and low attitude and contrarily a smaller one can be selected.