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JANNAF SUBCOMMITTEES
The JANNAF Executive Committee establishes subcommittees to focus on technical issues that are of interest to the JANNAF agencies. Their general goals are to promote the exchange of technical information and data, establish standard procedures and nomenclature, effect the coordination of government-funded propulsion programs, and provide expertise for the identification and solution of propulsion problems. Technical Steering Groups (TSGs), composed of representatives of the JANNAF agencies, manage the activities of each of the subcommittees. Each subcommittee forms panels to conduct the technical tasks assigned by the TSG. JANNAF Subcommittee participants include scientists and engineers from the JANNAF agencies, other government organizations, universities, and industrial affiliates. While voting and formal deliberations are limited to the members of the TSGs, participants are invited to be active in the information exchange activities of the subcommittees. Attendance at subcommittee technical meetings is by invitation only and is limited to U.S. citizens or qualified intending citizens who are employed by authorized U.S. organizations, who possess the appropriate security clearance, and who are working in the field of missile, space, or gun propulsion. There are currently 12 subcommittees and approximately 50 panels: AIRBREATHING PROPULSION SUBCOMMITTEE The scope of this subcommittee covers technical areas which include ram-compression airbreathing systems over the entire range of atmospheric propulsion for rocket and missile applications. Airbreathing systems include solid- and liquid-fuel ramjet, ducted rockets, expendable turbojets, supersonic/hypersonic aerospace plane and missile engines and combined-cycle engines oriented towards space and missile applications. The objectives include characterization of system performance through engine cycle analysis and testing, with particular test attention currently being given to supersonic and expendable turbojet systems; and understanding engine design from propulsion system and airframe integration through thermal management to characterizing advanced airbreathing fuels. [back to top]COMBUSTION SUBCOMMITTEETechnical areas of interest include chemical combustion phenomena within combustors of solid, liquid, hybrid, and airbreathing missile, space, underwater, and gun propulsion systems. The combustion phenomena encompass steady-state, transient, and unsteady processes. Airbreathing propulsion systems include ramjets and air-augmented systems. Work areas covered include analytical modeling and experimental research on fundamental combustion and fluid dynamic processes and their relation to the development and performance of solid, liquid, hybrid, and airbreathing rocket, missile, space, underwater, and gun propulsion systems. These work areas involve studying the dependence of the combustion and flow phenomena on parameters such as propellant systems, combustor configurations, environment, inlets, and nozzles. Specialized tests, instruments, and procedures are devised and standardized, partly to aid in validation of research methods, and eventually for use in design, testing, performance optimization, and quality control of production. [back to top]EXHAUST PLUME TECHNOLOGY SUBCOMMITTEEThis subcommittee explores phenomena associated with the exhausts from missile, space, and gun propulsion systems. These phenomena can be divided into three technical areas: plume flow-fields, plume radiation, and a broad area incorporating other plume effects. The plume flow-field encompasses the physical phenomenology required to describe the thermodynamic, gas dynamic, chemical and physical processes associated with the emission, scattering, adsorption, and reflection of electromagnetic radiation from exhaust plumes ranging over the spectrum from the ultraviolet and visible through the infrared and microwave regions. Plume effects include the interaction of plumes with external structures, leading to the imposition of loads of thermal, chemical, and mechanical stresses, and the electromagnetic interference effects which degrade guidance and sensor systems. [back to top]LIQUID PROPULSION SUBCOMMITTEEThe charter of the Liquid Propulsion Subcommittee addresses technical problems and issues of greatest national needs associated with liquid engine systems. Topics include technology, components and engines of main propulsion, divert and attitude control, reaction control and post boost systems applied to tactical, ballistic missile defense and strategic, in-space, and access to space propulsion.Liquid propulsion technology issues examined include overall engine system, component combustion, and propellant feed systems. Components issues that may be examined include liquid engine systems such as thruster assembly and thrust vector control; liquid combustion elements such as the thrust chamber and gas generator/preburner; and liquid propellant feed systems such as turbomachinery, tubes and ducting, pressurization systems, and propellant management. Fuel types include liquids, slurries, gels, endothermics, and cryogenics. Characterization of system and component performance is done through analysis, modeling and simulation, and engine testing and validation. [back to top]
The Modeling and Simulation
Subcommittee activities include virtual engineering (VE); integration
of propulsion components and integration of propulsion systems with other
vehicle systems; uncertainty assessment and management; and integrated
health management (IHM). Modeling and simulation ranges from hard computing
to soft computing to knowledge-based computing involving simulations of
ground-based testing to sub-scale and flight-testing. The credibility
assessments of models and simulations include verification and validation
(V&V), but exclude certification or accreditation. Guides, procedures
or standards are developed for conducting V&V and for managing simulation
uncertainty. Modeling and simulation for understanding of phenomena and
of propulsion components, and for developing components of propulsion
systems are excluded. [back to top] |
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To order JANNAF Publications
call 410-992-7300 or email pubs@jannaf.org |
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