Hypersonic Technology for Military Application (1989) / Chapter Skim
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Appendix F: Briefing and Meeting Schedule
Appendix F: Briefing and Meeting Schedule
Pages 100-105
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From page 100... ...
Although there are other programs of basic and applied research that are contributing to the technology base and to understanding of the behavior of hypersonic vehicles in flight, the X-30 is intended to be a key research vehicle, enabling exploration or the technologies critical to hypersonic flight. Similarly, in addressing technical risks and risk reduction for hypersonic applications, the NASP technology maturation program, though a subset of the overall hypersonic flight technology program, is of key importance.
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From page 101... ...
HYPERSONIC PROPULSION The committee considers the viability of the supersonic combustion ramjet to be a key issue for hypersonic applications, since it is the SCRAMJET that promises the high values of specific impulse at Mach numbers above 7, which are essential to global hypersonic flight or single-stage transportation to orbit. Yet from the information available thus far to the committee, serious questions of feasibility exist in a number of areas.
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From page 102... ...
LOW SPEED PROPULSION The principal area of concern here is the design of a low-speed propulsion that will provide adequate take-off and transonic thrust, sufficiently high specific impulse, high enough thrust to weight ratio, and be integrable into the SCRAMJET envelope without detriment to the RAMJET and SCRAMJET performance. The questions to which we are seeking answers are: What candidate systems are you considering and to what extent have you identified their performance characteristics including possible losses due to integration into the RAMIET and SCRAMJET?
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From page 103... ...
At the very high Mach numbers these phenomena will be complicated by the effects of nonequilibrium chemistry and perhaps radiation. Since we do not have and do not expect to have the capability to fully explore these complex phenomena experimentally, it would seem necessary to rely heavily on extrapolation by computational fluid dynamics techniques from the available data base.
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From page 104... ...
STRUCTURES AND MATERIALS The X-30 research vehicle and NASP technology maturation program are to explore structural concepts that will cope with the rigors of flight at hypersonic velocities and with the attendant structural integrity issues. Structural concepts must address, for examples, the choice of materials, thermal protection, active cooling, insulation, configuration, and fabrication.
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From page 105... ...
CONTROL The control system for the X-30 will have to integrate control of the vehicle attitude, engine geometry and fuel supply, center of gravity, and the trajectory to high degrees of precision because of the sensitivity of the hypersonic vehicle to all of these. It may also have to actively control lower frequency structural and shock modes, maintain shock positions in the inlet so as to maximize performance and avoid upstart, counter any thrust malalignments, etc.
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