Volume-adjustable and throat-variable small ignition tester for solid rocket engine

The invention discloses a volume-adjustable throat-variable solid rocket engine small ignition tester, which is characterized in that a combustion chamber and a front cover of a traditional ignition tester are connected through long threads, and the volume of the combustion chamber is adjusted by adjusting the depth of the front cover; and meanwhile, the nozzle throat liner is independently machined and connected with the nozzle shell through threads, so that the purpose of variable throat is achieved. In a ground ignition test and a spray plugging matching test, different test requirements can be met only by adjusting the volume of the combustion chamber and replacing the throat liner part by using the tester, so that the purposes of reducing the test cost and shortening the test period are achieved. 本发明公开了一种容积可调可变喉道固体火箭发动机小型点火试验器，将传统点火试验器的燃烧室与前盖通过长螺纹连接，通过调节前盖深度调节燃烧室容积；同时将喷管喉衬单独加工通过螺纹与喷管壳体连接，从而达到可变喉道的目的。在地面点火试验及喷堵匹配试验中，利用本试验器仅需要调节燃烧室容积及更换喉衬部分，即可适应不同的试验需求，从而达到降低试验成本，缩短试验周期的目的。