Development of a Novel Fast-Actuating Valve for Improved Ludwieg Tube Activation Efficiency

ABSTRACT: With hypersonic research becoming increasingly relevant, as viable technologies encroach on these speeds, heightened emphasis is being placed on effective methodologies of simulating hypersonic airflows. Specifically, Ludwieg Tubes have distinguished themselves as an effective and economical way to terrestrially produce hypersonic flow. In attempt to further increase their utility, researchers are seeking innovative valve solutions to initiate Ludwieg Tube discharge, thereby replacing traditional burst diaphragms.Mainstream Engineering proposes to develop a novel fast-actuating valve that will provide for easier operation and reduced down-time between testing. The Phase I work plan, presented in this proposal, details the fabrication and validation of a proprietary valve design for the AFRL Mach 6 wind tunnel. This valve will repeatedly seal against 600 psi air, at 450 F, while being able to fully open in less than 50 ms. Furthermore, the proposed valve will be designed to operate reliably for 50,000 Ludwieg Tube cycles. Upon successful completion of Phase I, Mainstream will scale-up its valve design in Phase II, for integration into the future University of Notre Dame Mach 6 wind tunnel. Mainstream has proven its effectiveness as an SBIR contractor with a successful track record of commercializing products over the past 30 years.; BENEFIT: Mainstreams fast-valve is a simple design that provides for increased operational efficiency of any blowdown or Ludwieg Tube hypersonic wind tunnel. Once validated in Phase I and Phase II wind tunnel applications, the proprietary Mainstream valve design can be easily integrated into any existing or future design that requires repetitive fast actuation of a high-enthalpy gas. Such industry demand could include the expanded high-speed wind tunnel community, oil and natural gas, gas gun applications, and bulk solid pneumatic conveyance.