1. Mechanical and Materials Engineering Division, Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228-0510
2. Turbocompressors & Steam Turbines Division, Nuovo Pignone, Via Felice Matteucci, 2 Firenze, 50127 Italy
3. Department of Mechanical Engineering, Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843-3254
4. Engine and Vehicle Research Division, Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228-0510