Objective: The 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, engines for small launch vehicles, hybrid engines, and access to space propulsion.

Liquid propulsion technology issues examined include overall engine system, thrust chamber assembly components, and propellant feed systems. Component 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, lines, ducts, valves, tanks, and pressurization systems. 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 validation.

LPS Mission Areas

The JANNAF 8th Liquid Propulsion Subcommittee meeting will include sessions in five general technical areas: liquid engine systems; liquid combustion subsystems and components; liquid propellant feed and pressurization systems; tactical liquid and gel propulsion systems; and advanced materials for liquid propulsion applications. Papers are solicited that will aid in the design, development and test of efficient and stable liquid propulsion systems.

Mission Area I: Liquid Engine Systems

Mr. Jason B. Turpin, NASA-MSFC/ Huntsville
Telephone:   (256) 544-2807

Dr. Gregory A. Ruderman, AFRL/Edwards AFB
Telephone:   (661) 275-5332

System Analysis and Trades: Analytical tools, computational models, and methodologies for liquid engine system analysis and design trade methods; cost and weight models; boost/upper-stage engine design tools; model validation methods and criteria; technology and risk identification.

Health Management and Controls: New and innovative approaches for sensing engine system performance and hardware condition characteristics during all phases of operation (including preflight prep, prestart, start, flight, shutdown, safing and turnaround) with an emphasis on improving overall system reliability and maintainability. Papers discussing instrumentation innovations, failure prognostic and diagnostic algorithms, maintenance prognostic and diagnostic algorithms, and new and innovative target platforms for performing real-time health management are of interest.

Test Practices, Standards, and Facilities: Industry-consensus best practices and standards for the test and evaluation of liquid engines, components and propulsion/vehicle interaction. Status, capabilities, and operation of government and commercial rocket engine test facilities. This includes training, problem reporting, failure investigation, lessons learned, safety, FOD control, process control, and infrastructure improvements to meet aggressive technical goals. Concepts and innovations for engine life testing, engine fault detection, flight qualification testing practices, data reduction and uncertainty analysis methodologies, and other test needs to meet future demands are of interest.

Long-Life, Reusable, and Long-Duration Engine Design and Integration: Methodology for the design of long-life and long mission duration operable chemical rocket engine propulsion systems. Long-life engines with current performance levels that have extremely high reliability and operability with 40+ cycles of engine life. Design methodologies for engines with highly responsive, rapid turnaround operational capability.

Small Launch Vehicle Engines: Design, development, test, and evaluation approaches for small launch vehicle liquid propellant rocket engines: vehicle integration, safety and reliability, fabrication, testing, verification, validation, operations, and the affordable integration of those areas.

Liquid Engine Systems for Human-Rated Launch Vehicles: Design, analysis, development, test, and evaluation approaches and planning associated with liquid propellant rocket engines for use on human-rated launch vehicles; including NASA’s Space Launch System (SLS) and vehicles intended for commercial space tourism applications. Functional requirements and design concepts and/or design modifications for the engines on these vehicles. Approaches for meeting government (NASA, FAA, or OCST) safety and reliability requirements for operation with crew and passengers, including fault tolerance; fault detection, isolation, and recovery; crew interaction, reliability predictions and models, and qualification/certification testing requirements and approaches.

LRE Development History: Papers addressing the important process which LRE have gone through in the course of their development. Particular subjects of note are successes, failures, mishaps, and lessons learned. Topics can be detailed in their information or can provide a general overview of the program. Papers are not limited to flight systems; testbeds, proof-of-concepts, and R and D programs are encouraged as well.

Operability: Papers addressing the operational needs of rocket engines. Operability entails all aspects with rapid turn-around, automated checkout, cleaning, rapid remove-and-replace, etc. This mission area seeks new techniques, processes, design requirements, and proposed design changes to the combustion devices that enable operability.

Mission Area II: Liquid Combustion Subsystems and Components

Dr. Christopher S. Protz, NASA-MSFC/Huntsville
Telephone:   (256) 544-6956

Mr. Nils M. Sedano, AFRL/Edwards AFB
Telephone:   (661) 275-5972

Thrust Chamber Assembly (TCA) Design and Applications: This mission area addresses the components and subcomponent features required in all sizes of liquid rocket engines. Components include main combustion chambers, preburners, gas generators, nozzles, and their subcomponent features including items such as injectors, stability aids, and coolant passages. Papers on combustion devices are being sought that cover all aspects of design analysis, component test results, test rig development, diagnostic techniques, and novel design features that are being made possible by manufacturing advances.

Hydrocarbon Fuel Properties, Performance and Specifications: Papers addressing chemical composition, physical properties, fit-for-purpose quality, colling and combustion perfformance, and specification for various hydrocarbon fuels, includeing RP-1/RP-2, methane, LNG, JP-10 and other high energy density propellants, and alternatively derived fuels (F-T), fIPK, ATJ, etc.); experimental and numerical efforts to characterize operational performance of these fuels in terms of cooling, combustion, and other applikcation-specific processes.

Combustion Stability: Papers addressing design and performance challenges, modeling and simulations techniques, and scaling methods associated with combustion stability in main combustion chambers, preburners, and gas generators for all sizes liquid rocket engines.

Liquid Injection Systems: The injection system of liquid rocket engines is critical to system performance. This mission area seeks papers describing new injector concepts, the physical processes required to understand injection concepts (including supercritical jets, sprays, and droplets), and methods to determine injector performance and stability.

Modeling and Simulation: Recent advances in modeling and simulation bring forward new capabilities to performance prediction and design of combustion devices. Papers are sought that look at the recent developments, new techniques, results of implementation or comparison with tests. Aspects covered include, but are not limited to: hot gas flow fields, heat transfer, cooling mechanism, integrated models, and injector element dynamics.

Advanced Liquid and Gel Propellants: Papers are sought addressing advanced liquid and gel propellants and the development of supporting technologies such as “Green” propellants, fuel management systems and lightweight tankage systems to advance state-of-the-art chemical capabilities.

Hybrid Rocket Engines: Papers addressing hybrid rocket engine systems and the combustion process in these systems.

Mission Area III: Liquid Propellant Feed and Pressurization Systems

Mr. James L. Cannon, NASA-MSFC/Huntsville
Telephone:   (256) 544-7072

Lt. Jacob Robertson, AFRL/Edwards AFB
Telephone:   (661) 275-3240

Turbomachinery Design and Applications: Turbopump-fed liquid rocket engine systems require the use of high speed and high performance rotating machinery. Turbomachinery for this application requires support from a wide range of technical disciplines. Technical areas typically considered include the design, analysis, and testing of inducers, impellers, turbines, seals, bearings and structural elements. Papers on liquid rocket engine turbomachinery are being sought that cover all aspects of design, analysis, code development, component test results, test rig development, diagnostics techniques, and system level testing.

Pressurization and Feed Subsystem Design and Applications: This area covers all aspects of design, analysis and testing of the propellant feed system and engine system specific elements. The propellant feed system is composed of tanks, major component lines, pressurization systems, ducts, feed system control valves, and suppression systems. Engine system specific elements include ducts, flow measurement devices and valves. Papers are being sought which address design, analysis, tool development, diagnostics techniques, and testing of propellant feed system elements and engine system specific elements.

Mission Area IV: Advanced Materials for Liquid Propulsion Applications

Mr. Clyde "Chip" Jones, NASA-MSFC/Huntsville
Telephone:   (256) 544-2701

Mr. Jamie B. Malak, AFRL/Edwards AFB
Telephone:   (661) 275-5539

Material Applications in Liquid Rocket Engines: Papers are sought addressing advanced materials and processing for liquid rocket propulsion systems, including:

  • Material technologies resulting in significant thrust-to-weight ratio increases and/or performance advantages over state-of-the-art capabilities
  • Lightweight, high-temperature nozzle materials
  • Polymer matrix composites (PMCs) for lightweight components and structures
  • PMC resin development for high-temperature or cryogenic environments
  • Materials for lightweight lines, ducts, valves, and tanks
  • Metals, ceramics, and their composites for component applications
  • Materials and production methods for lower lifecycle costs
  • Near net shape production for components and structures
  • Modeling of materials for liquid rocket engines

Materials For Commercial Space Transportation: The recent shift by NASA to commercial space transportation to the ISS under COTS has created the need for low-cost, high performance material solutions for a new generation of space vehicle engines. Papers are sought addressing areas such as:

  • Materials selection criteria
  • Material characterization requirements
  • Flight qualification standards for materials
  • Risk management as related to materials selections

Heavy Lift Launch Vehicles: A need for heavy lift launch vehicles (>100 metric tons payload) has been identified for future space exploration and other missions. Such a launch vehicle will likely require engines in the 1 million pound thrust class as well as smaller upper stage and other liquid-fueled engines. Papers are sought addressing materials and processes:

  • Manufacturing and production of new liquid fueled engines
  • Integrated health management for materials and structures
  • Lightweight tanks and composite ducts
  • Materials for reusable engines
  • Concepts for material solutions that optimize the entire propulsion system for improved performance

Nanotechnology For Liquid Propulsion Systems: Application of new nanomaterials to liquid propulsion systems has the potential to greatly increase performance of future engines. Papers are sought to address:

  • Nanomaterials and nanoprocessing to improve strength, conductivity, density, modulus, and other properties
  • Concepts of how to integrate nanotechnology into future liquid-fueled rocket engines
  • Nanotechnology areas that may have high payoffs for liquid rocket engine systems

Materials For Green Fuel Engines: In addition to the traditional hydrogen, hydrocarbon and hypergolic engines, new engines with “green” fuels such as methane and ethanol as well as newer fuels that go beyond the traditional definition of green fuels have been proposed. Little work has been done to address the compatibility of these fuels and their combustion products with current and potential future engine materials. Papers are sought to address:

  • Environmental corrosion issues for both the fuels and the combustion products
  • Compatibility test methods
  • Materials concepts for future green fueled engines
  • Concepts for future engines and materials for them

Turbomachinery Materials: Turbomachinery require new materials or coatings to address new engine cycles such as oxygen-rich staged combustion. The chemical and temperature environments will be considerably different than prior expander or gas-generator cycles. Papers are sought to address potential issues such as:

  • Hydrogen and oxygen compatibility
  • Testing for oxygen promoted combustion and hydrogen embrittlement
  • Development process for new materials
  • Criteria for inserting new materials into turbomachinery for hydrogen-, hydrocarbon- and green-fueled engines

Mission Area V: Special Topic: Engine Health Management (EHM) "Technology Roadmap"

Mr. James A. Larkin, Aerojet Rocketdyne/West Palm Beach
Telephone:   (561) 882-5370

This session will provide an opportunity to play a role in the creation of an Engine Health Management (EHM) “Technology Roadmap”. The focus will be on defining future EHM technology needs and challenges, as well as methods by which to close requirement gaps. The Liquid Propulsion Subcommittee’s EHM Panel will coordinate this effort across academia, Government, and industry. Technical areas include, but are not limited to: Hardware, Software, and Processes. Reusable and expendable systems will be addressed.

Liquid Propulision Subcommittee Co-Chairs

Dr. Richard Cohn, AFRL/Edwards AFB
Telephone:   (661) 275-6177

Mr. James L. Cannon, NASA-MSFC/Huntsville
Telephone:   (256) 544-7072

CADRE Technical Representative

Mr. Peter Zeender, JHU-CADRE
Telephone:  (443) 718-5001