Experimental device for measuring condensed phase distribution in unilateral expansion nozzle in rocket mode

By designing the experimental setup in rocket mode and utilizing a transparent window and optical measurement system, the problem of observing the distribution of condensed particles inside a single-sided expansion nozzle, which is impossible in traditional experiments, was solved, thus achieving non-contact measurement and data support.

CN122082908APending Publication Date: 2026-05-26BEIJING INST OF TECH
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Patent Information

Application Number
CN202610323551.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-17
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Traditional engine hot-run tests cannot directly capture the distribution and flow state of condensed particles inside a single-sided expansion nozzle, lack an effective optical observation window, and cannot achieve non-contact measurement.

Method used

An experimental setup was designed, comprising a two-phase flow gas generator, a single-sided expansion nozzle, and an optical measurement system. By setting transparent windows at key locations and combining a high-speed camera system and a Malvern laser particle size analysis system, non-contact visual observation and measurement of condensed particles can be achieved.

Benefits of technology

It enables non-contact measurement of the distribution and size of condensed particles inside a single-sided expansion nozzle, providing key experimental data support and a hardware foundation for engine design and optimization.

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Abstract

The invention belongs to the technical field of rocket-based combined cycle engine testing, and discloses an experimental device for measuring condensed phase distribution in a unilateral expansion nozzle in a rocket mode, which comprises a two-phase flow fuel gas generator connected with an ignition system and used for simulating a rocket working mode of a rocket-based combined cycle engine. High-pressure and high-temperature fuel gas containing a condensed phase is generated and output; the inlet end of the single-side expansion spray pipe is communicated with the outlet end of the two-phase flow fuel gas generator, and the single-side expansion spray pipe is used for receiving condensed-phase-containing high-pressure and high-temperature fuel gas output by the two-phase flow fuel gas generator; the optical measurement system, the two-phase flow gas generator and the single-side expansion nozzle are all provided with transparent windows, and the optical measurement system conducts non-contact measurement on condensed phase particles in the two-phase flow gas generator and the single-side expansion nozzle through the transparent windows. Visual and non-contact measurement of the condensed phase particle distribution state and the particle size in the single-side expansion nozzle is achieved, and experimental data support is provided for engine design and optimization.
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