Cold flow analysis of spray angle and droplet size distribution of a pintle injector for green hypergolic propellants

Kurzfassung

In this paper, the effects of spray angle and droplet size for green hypergolic propellants in an initial cold flow investigation using a pintle injector is described. Therefore, simulants were used to match the rheological properties of the propellant combination. The spray was monitored by a shadowgraph setup and measured by a droplet size measurement system. With shadowgraph measurements the spray cone angle was determined and compared to previous research literature. First insights of the influence of high viscous fluids on droplet size distribution from pintle injectors could be gained. Results indicate that the viscosity has a minor influence on the spray angle but larger impact on droplet size.