Performance Analysis of a Low-Power Tangential Flow Turbine With Rotary Channel

[+] Author and Article Information
Silvio Barbarelli, Gaetano Florio, Nino Michele Scornaienchi

Mechanical Department, University of Calabria, Via Ponte Pietro Bucci 87036 Arcavacata di Rende, Cosenza, Italyg.florio@unical.it

J. Energy Resour. Technol 127(4), 272-279 (Apr 15, 2005) (8 pages) doi:10.1115/1.1944008 History: Received May 05, 2004; Revised April 15, 2005

A tangential flow prototype turbine with a rotating channel containing five optimized deflectors is presented. This atypical turbine configuration may be useful for application in the low ns high ds region of the Balje chart, where conventional turbines offer very poor performances. A 70kW maximum brake power, pressured-air test rig has been used for the analysis of operating characteristics, such as pressure, temperature, flow rate, and brake power. An electronic data acquisition system for automated measurement management was employed. An experimental campaign was carried out to identify the distribution of the pressure in the rotary ducts of the turbine. The results indicate the presence of a pressure gradient in the immediate vicinity of the inlet jet that is strongly attenuated when the ducts are not directly in contact with the jet.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 4

Prototype of turbine with five deflectors and main components of the machine

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Figure 5

Detail of a deflector

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Figure 1

Scheme of the turbine

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Figure 2

Detail of the regulating moving spear

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Figure 3

Sequence of the outflow phases relative to a single sector

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Figure 7

Efficiency curves of the prototype with five deflectors as a function of the characteristic parameter u∕co for feed pressure po=4bar and variable Kp opening

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Figure 8

Power curves of the prototype with five deflectors as a function of the rotational regime for feed pressure po and Kpopening=0.6

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Figure 9

Efficiency curves as a function of Kp for different u∕co

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Figure 10

Shaft power as a function of Kp for different rpm, for po=3bar

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Figure 11

Efficiency contours of the prototype with five deflectors

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Figure 12

Power-Efficiency contours of the prototype with five deflectors

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Figure 13

Efficiency as a function of Kp for different rpm, at po=5bar

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Figure 14

Work region of the prototype with five deflectors on the ns−ds plane

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Figure 15

Pressure probe measurement positions

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Figure 16

Pressure history at the (a) first, (b) second, (c) third, and (d) fourth measurement position



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