Aeropropulsion and Power Technology

Small low-cost propulsion systems are required for a variety of new unmanned air vehicle applications. Turbojet engine-generator systems are considered desirable for these small aircraft applications where compact size and low-cost are critical parameters. Technical Directions Inc. has developed a family of very low-cost turbojet engines for these aircraft applications using automotive turbocharger rotating components that satisfy many of the requirements in these applications. Future aircraft are being considered with increased mission complexity and additional range requirements. With frame sizes already established in many of the small aircraft applications, finding space for additional fuel to satisfy the mission requirements becomes almost an impossible assignment. This program will create the technology for a performance upgrade to existing low-cost engines to permit a 10-20% range extension. New design methods will be explored for the aerodynamic engine components that would provide operating efficiency gains of 5-15%. In these small turbojet engines, good component efficiencies are more difficult to achieve due to the effects of additional leakage and manufacturing tolerances making the performance improvements even more challenging. Accomplishing the program objectives herein will provide the desired additional range and mission capability without the need for additional fuel.