Engine Components For Turbine Punch Combination Design Method And Flow Field In Value Research

For adapting the requirement of hypersonic speed propulsion system, which has wide flight envelop and high battle performance, combined cycle engine was paid attention in more and more country in the world. Because turbine based combined cycle has mature turbine technology, being contrasted with other types of combined cycle engines it has more attraction for hypersonic speed prolusion system. In other countries, such as America and Japanese, both of them have great technology development in the flied of turbine-ramjet combined cycle, however, in our country the technology in that field is poor, the research in that field is important, and has practical and research value.This paper had designed and studied the primary components of turbine-ramjet combined cycle. In the process of inlet design, based on equality shock theory, collocated shock configuration, ascertained inlet geometry dimension, designed a outer- compress inlet. For matching turbine work condition, designed a diffuser that transformed square to round, chose central line and shape changed method, defined diffuser expanding angle. In the design of combustor, gave a design method of Vee gutter flame holder, based on CFD software, numerical simulation Vee gutter flame holder internal flow condition, discussed the position of holder in combustor influenced airflow pneumatic parameter. For integrative hypersonic speed proportion system, using non-axis symmetry nozzle can match the trail of airplane well, so in this paper, gave a design method of 3-D round-to-square nozzle, disused the choice issue of central line and the ratio of width to height. For checking out the validity of design methods that were referred above, using CFD software examined examples. In the end part of this paper, numerical simulation the whole turbine-ramjet combine cycle in one flight contrail.The results showed that the outlet airflow speed of the designed inlet could notbe too low to avoiding flow separation in square-to-round diffuser. The designed Vee gutter flame holder had certain relative higher total pressure recovery, the closer distance between flame holder and combustor inlet, the higher total pressure of outlet flow, however, the shorter length of the mixture part, where turbine outlet flow and ramjet outer channel flow mixed. Then the uniformity of two-part flow became deteriorated. In the practice, should balance and choose in the two issues. Internal flow condition of 3-D round-to-square nozzle was considered reasonable, so the design method was correct.