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OCR for page 90
66
HYPERSONIC TECHNOLOGY FOR MILITARY APPLICATION
areas, it should be noted that many
of the facilities are 20 to 40 years
old and do not have flow condi-
tions of sufficiently good quality
for aerodynamic and chemical kin-
etic testing and code validation.
4) Facility development and construc-
tion require a five to 10 year
period and new facilities are not
therefore likely to contribute
substantially to design definition of
the NASP research vehicle.
Facilities for structural testing at
1200° C and above do not exist.
Details of the upper atmosphere,
including its local composition and
flow turbulence are not sufficiently
well-known to adequately establish
the relation of flight conditions to
results from ground test facilities.
7) Hypersonics requires a substantial
and continuing investment in the
development of new facilities and
instrumentation.
8) In the Mach number range of 5 to
10, the knowledge and technology
for facility construction exist;
however, we have not developed
the facilities to generate the
required data base.
9) At Mach number 10 and above, no
one facility today can fully sim-
ulate all hypersonic flight para-
meters.
10) Continued research is needed to
explore the possibilities of develop-
ing such a facility for aerodynamic
and propulsion testing and CFD
validation.
1 1 ) In the absence of full simulation,
limited simulation testing should be
done where possible for CFD valid-
ation.
OCR for page 91
HYPERSONIC TECHNOLOGY FOR MILITARY APPLICATION
APPENDIX A: Statement of Task
67
With the current interest in and potential for hypersonic flight, there is a
need to determine for the Air Force and for the nation the research and development
approaches required to realize the opportunities offered by flight in this regime.
In its report, National Aeronautical R&D Goals, March 1985, the Aeronautical
Policy Review committee of the OSTP enunciated a transatmospherics goal as, "exploiting
the growing convergence of aeronautics and space technology." It states that "the
capability to routinely cruise and maneuver into and out of the atmosphere, to gain rapid
responsiveness for low earth orbit missions (manned or unmanned), or to attain very
rapid transport services between earth destinations from conventional runways, must be
viewed as aerospace options with global importance for the future."
The National Aerospace Plane program has been established to build a single
stage research vehicle that can take off from a runway, achieve orbit, and return. A
joint program among DARPA, Air Force, SDIO, Navy, and NASA, with planned total
funding of $3.1B, NASP is in an accelerated technology development phase (II), which
leads to a phase III technical readiness assessment in late 1989. If the assessment is
positive, the program will proceed to design, fabrication, and test of a flight research
vehicle in the 1990-1995 period.
Against this background, the task of the AFSB committee on hypersonic
technology is to:
determine possible military uses of hypersonic flight
draw on the developing hypersonic technology base, including the evolving
results of NASP Phase II, to assess the technical feasibility of meeting the
potential applications.
identify the technological needs for hypersonic flight.
assess the research and development support requirements including
availability of expertise, data bases, and test facilities.
provide technical advice to the command level on the research and
development strategy of the NASP, including:
0 the level of technical risk in a single-stage to orbit research vehicle, and
strategies for risk reduction
0 the research vehicle program approach to maximize the acquisition of
knowledge in the most critical technical areas.
Representative terms from entire chapter:
hypersonic technology
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