This paper describes the design of a liquid-propellant-powered hot-gas actuator appropriate for human-scale powerautonomous robots. The motivation for this work is the development of a lightweight actuation system with system energy and power densities significantly greater than a DC motor and battery combination. The proposed design of a liquid-fueled actuator is presented, followed by a therm...

This study conducts experimental research on the liquid sloshing performance of a vane-type tank used in high orbit satellites. The tests without propellant management device (PMD) were developed under different liquid-filling ratios. Liquid with PMD performed directions and test results agree considerably theoretical results, indicating system’s reliability. A linear relationship was observed ...

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A numerical framework based on the generalized finite element method (GFEM) is developed to capture the coupled effects of thermomechanical deformations and thermal gradients on the regression rate of a heterogeneous solid propellant. The thermomechanical formulation is based on a multiplicative split of the deformation gradient and regression of the heterogeneous solid propellant is simulated ...

Reusable liquid-propellant rocket engines (LPREs) imply more demanding robustness requirements than expendable ones due to their extended capabilities. Therefore, the goal of this article was develop a control loop adapted all operating phases LPRE, including transients, and robust internal parametric variations. First, thermo-fluid-dynamic simulators representative gas-generator-cycle were bui...

Research has shown that oscillatory or modulated flows can achieve a significant increase in heat transfer relative to the corresponding steady flow, providing that critical or threshold amplitude is achieved. The threshold condition is associated with the production of near-surface turbulence by the oscillatory motion. A similar process is hypothesized as a mechanism of highamplitude acoustic ...

The lecture presents an overview of some recent results of the work carried out at Alta on the hydrodynamic design and rotordynamic fluid forces of cavitating turbopumps for liquid propellant feed systems of modern rocket engines. The reduced order models recently developed for preliminary geometric definition and noncavitating performance prediction of tapered-hub axial inducers and centrifuga...