Analytical and Empirical Characterization of Hybrid Rocket Swirl Injection Presenters: Matt H. Summers Advisor: James K. Villarreal.

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Presentation transcript:

Analytical and Empirical Characterization of Hybrid Rocket Swirl Injection Presenters: Matt H. Summers Advisor: James K. Villarreal

Daedalus Astronautics Dual Purpose: Teaching rocketry and basic physics to k-12 students Advanced propulsion research/Sounding rockets

Project Motivation Analytics: - Preliminary computational fluid dynamic analysis - rapid results - Low cost Empirical: - Minimized testing – Low cost - Develop an empirical characterization of hybrid swirl injection Future Work: - Ability to test multiple components of a Hybrid Rocket Motor - Long-term, low-cost, easy apparatus - Great predictor for future research

Analytics Results: psi Tank Pressure psi chamber pressure - Turbulent flow achieved -Increased oxidizer mass flux Figures shown are using a 60° super-critical injector. Top-Right: Density distribution in CTRZ flow structure. Bottom-Right: Constant pressure distribution in HRM. Left: Varying Temperature distribution in HRM. CTRZ: Central Toroidal Recirculation Zone

Design Selected Injectors: - No Swirl - 0° Swirl - 15° Swirl - 20° Swirl - 30° Swirl - 35° Swirl - 42° Swirl - 60° Swirl Figure here shows how hybrid swirl injectors are classified based on their radial injection angle.

Fabrication Selected Injectors: - No Swirl - 0° Swirl - 15° Swirl - 20° Swirl - 30° Swirl - 35° Swirl - 42° Swirl - 60° Swirl Example of print created for the 42° swirl injector Machined injectors with their respective swirl angles

Cold-Flow Testing Results: - No Swirl Test - 2 sec test lb ∆ M in Tank - Mass Flow Rate = 0.3 lb/s - No CTRZ - 60° Swirl Test - 2 sec test lb ∆ M in Tank - Mass Flow Rate = 0.3 lb/s - CTRZ Formation Flow of No Swirl Injector Flow of 60° Swirl Injector Forward Enclosure deflects swirl flow to initiate CTRZ No CTRZ present – no pre-heating

Hot-Fire Testing Upon completion of the motor case. Testing of Full-Scale Hybrid Rocket Motor on Campus Before After

Empirical Current Equation for regression rate of HTPB fuel grain Potential Equation for regression rate of HTPB fuel grain Swirl Flow passing through the Pre- Combustion Chamber

Questions?