Research Papers: Gas Turbines: Cycle Innovations

Starting Characteristic Analysis of a Radial Inflow Turbine for the Regenerative Brayton Cycle

[+] Author and Article Information
Susumu Nakano

Hitachi Research Laboratory,
Hitachi, Ltd.,
7-1-1, Omika,
Hitachi, Ibaraki 319-1292, Japan
e-mail: susumu_nakano@mhps.com

Tadaharu Kishibe

Hitachi Research Laboratory,
Hitachi, Ltd.,
7-1-1, Omika,
Hitachi, Ibaraki 319-1292, Japan
e-mail: tadaharu_kishibe@mhps.com

Manabu Yagi

Infrastructure Systems Company,
Hitachi, Ltd.,
630, Kandatsu,
Tsuchiura, Ibaraki 300-0013, Japan
e-mail: manabu.yagi.cb@hitachi.com

Kuniyoshi Tsubouchi

Hitachi Research Laboratory,
Hitachi, Ltd.,
7-1-1, Omika,
Hitachi, Ibaraki 319-1292, Japan
e-mail: Kuniyoshi.tsybouchi.fx@hitachi.com

Takanori Shibata

Hitachi Research Laboratory,
Hitachi, Ltd.,
7-1-1, Omika,
Hitachi, Ibaraki 319-1292, Japan
e-mail: takanori_shibata@mhps.com

1Present address: Research & Development Center, Mitsubishi Hitachi Power Systems, LTD., 1-1 Saiwai-cho, 3-chome, Hitachi, Ibaraki 317-0073, Japan.

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 18, 2014; final manuscript received September 9, 2014; published online December 9, 2014. Assoc. Editor: Joost J. Brasz.

J. Eng. Gas Turbines Power 137(6), 061701 (Jun 01, 2015) (7 pages) Paper No: GTP-14-1035; doi: 10.1115/1.4028765 History: Received January 18, 2014; Revised September 09, 2014; Online December 09, 2014

Microturbines have been developed as compact gas turbines to be applied in the regenerative Brayton cycle. A typical microturbine is composed of a centrifugal compressor and a radial inflow turbine. As such, the microturbine has a starting characteristic peculiar to radial inflow turbines. An idling state known as the windage point for mass flow rate can be formed because of improper inlet flow conditions for turbine expansion flow. The present study looked at the relationships between the radius ratio of the radial inflow turbine to the centrifugal compressor and the starting characteristic and at the effects of turbine inlet flow conditions on the starting characteristic. Fundamental equations for the relationships between the radius ratio and the starting characteristic were obtained. Effectiveness of the equations was compared with experiment results obtained with a 150 kW class prototype microturbine.

Copyright © 2015 by ASME
Your Session has timed out. Please sign back in to continue.


Paul, C., 1997, “The Capstone Turbogenerator as an Alternative Power Source,” SAE Technical Paper No. 970292. [CrossRef]
O'Brien, P., 1998, “Development of a 50 kW, Low-Emission Turbogenerator for Hybrid Vehicles,” ASME Paper No. 98-GT-400. [CrossRef]
Rodgers, C., 2000, “25-5 kWe Microturbine Design Aspects,” ASME Paper No. 2000-GT-0626. [CrossRef]
Ishii, K., 2002, Micro Gas Turbine System, Ohm Publishing, Tokyo, p. 59, (in Japanese).
Watanabe, I., Katagiri, R., Konishi, K., Yoshiki, H., and Tashiro, S., 2000, “Effects of Windage Characteristics for Predictions of Turbo-Charger Turbine Performance,” Proceedings of 28th Annual Gas Turbine Conference, pp. 53–58 (in Japanese).
Nakano, S., Kishibe, T., Araki, H., Yagi, M., Tsubouchi, K., Ichinose, M., Hayasaka, Y., Sasaki, M., Inoue, T., Yamaguchi, K., and Shiraiwa, H., 2007, “Development of a 150 kW Microturbine System Which Applies the Humid Air Turbine Cycle,” ASME Paper No. GT2007-28192. [CrossRef]
Nakano, S., Kishibe, T., Inoue, T., and Shiraiwa, H., 2009, “An Advanced Microturbine System With Water Lubricated Bearings,” Int. J. Rotating Mach., 2009, p. 718107. [CrossRef]
Tatsumi, T., 1985, “32-PS Small Gas Turbines,” J. Internal Combust. Eng., 24(308), pp. 68–70 (in Japanese).
Trimble, K. A., 1989, “Advanced Energy System Program Annual Report,” Gas Research Institute, Des Plaines, IL, Report No. 89-62095.
Dawes, N. W., 1988, “Development of a 3D Navier Stokes Solver for Application to All Types of Turbomachinery,” ASME Paper No. 88-GT-70.
Launder, B. E., and Spolding, D. B., 1974, “The Numerical Computation of Turbulent Flows,” Comput. Methods Appl. Mech. Eng., 3(2), pp. 269–289. [CrossRef]
Mishina, H., and Nishida, H., 1983, “Performance Prediction of Centrifugal Compressor, First Report, Prediction Method and Calculation Results,” JSME Paper, Ser. B, 49(441), pp. 1000–1009 (in Japanese). [CrossRef]


Grahic Jump Location
Fig. 1

Microturbine system diagram

Grahic Jump Location
Fig. 2

Photograph of the turbine rotor

Grahic Jump Location
Fig. 3

Calculation region

Grahic Jump Location
Fig. 4

Compressor performance characteristics

Grahic Jump Location
Fig. 5

Calculation results of starting pressure ratio: (a) (Cη = 1.0) and (b) Cη = 0.85

Grahic Jump Location
Fig. 6

Temperature effects on starting pressure ratio

Grahic Jump Location
Fig. 7

Calculation conditions for γ and θ

Grahic Jump Location
Fig. 8

Margins of the starting pressure

Grahic Jump Location
Fig. 9

Experimental results of the isolated turbine test

Grahic Jump Location
Fig. 10

Experimental results of the reaction

Grahic Jump Location
Fig. 11

Calculated relative velocity streamlines from the numerical analysis. Turbine nozzle inlet air temperature of (a) 297 K and (b) 523 K.

Grahic Jump Location
Fig. 12

Experimental results of the prototype machine



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In