直连式脉冲燃烧高温风洞的设计

Design of Direct-Connect Impulse Combustion Wind Tunnel

为经济、有效地开展超燃室试验研究。设计制作了直连式脉冲燃烧高温风洞．该风洞采用燃烧氧氮混合气体和氢氮混合气体获得高焓气体。氧氮混合气体和氢氮混合气体分别采用路得维希管和稳压燃料供应装置供应．稳压燃料供应装置经过特别设计，以消除试验后残余氢气的安全隐患，并维持试验期间的供应压力基本恒定；采用专门的气动快速阀。以控制2种混合气体快速同步注入燃烧加热器．风洞运行结果表明，燃烧加热器可在总温1100—2200K。总压1．0—4．0MPa的范围内工作，能提供100—150ms试验时间．

To effectively and economically investigate the performance of supersonic combustors, a new kind of direct-connect impulse combustion wind tunnel was designed and constructed. It provides a high-enthalpy flow by combusting oxygen/nitrogen and hydrogen/nitrogen provided by a Ludwieg tube and a fuel-providing device, respectively. The fuel-providing device was elaborately designed to eliminate insecurity result from residual hydrogen after a run, and maintain nearly a constant pressure in a test. Specially-designed pneumatic high-speed valves were used to control the rapid synchronizedinjection of oxygen/nitrogen and hydrogen/nitrogen into a combustion heater. The operation results show that the combustion heater can provide a wide operation range with a total temperature of 1 100 to 2 200 K, a total pressure of 1.0 to 4. 0 MPa and a duration of 100 to 150 ms.