Evaluation of Foam Coolants.
Abstract
An experimental program was conducted in a nominal 3000 lbf, 300 psia, N2O4-UDMH rocket engine to directly compare the cooling performance of three new foam formulations containing sugar or a micro-sized silica solid or 'Light Water' concentrate and two new liquid formulations containing soluble sodium silicates or a mixture of sugar plus dibasic phosphate (a blowing agent) with the known cooling results of a protein foam. It was concluded that additives such as fumed silica and a mixture of sugar plus (NH4)2 HP O4 have a slight beneficial effect on coolant capacities. More importantly, coolant efficiency and streaking resistance appeared to be affected more by run duration and rocket engine mechanics such as injector-chamber interaction then by coolant composition. However, the results of the cooling formulation containing its own blowing gas were positive enough to warrant recommending further analytical and experimental testing. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1969
- Accession Number
- AD0860121
Entities
People
- Newell C. Rodewald