Universal Journal of Mechanical Engineering Vol. 2(5), pp. 163 - 168
DOI: 10.13189/ujme.2014.020503
Reprint (PDF) (409Kb)

Numerical Studies of Twisted Vaned Diffuser on the Performance of a Centrifugal Compressor Stage

P.Venkateswara Rao ^*, G.V.Ramana Murty , G. Venkata Rao
Dept. of Mechanical Engineering, Vasavi College of Engineering, Hyderabad 500031

ABSTRACT

This paper examines the effect of twist in diffuser vane from hub to shroud on the performance of an industrial centrifugal compressor stage. The chosen diffuser has an aerofoil section with varying blade chord from hub to shroud due to blade twist or in other words, the solidity of the diffuser blade is varied from hub to shroud. The twisting is given to the diffuser blade by rotating the diffuser blade opposite to the direction of rotation of the impeller keeping its leading edge as origin resulting in different stagger angles from hub to shroud. The analysis was conducted at an impeller tip Mach number of 0.35. The overall stage performance is evaluated in terms of head coefficient, stage efficiency and power coefficient of the stage and static pressure recovery coefficient of diffuser vanes for different diffuser vane twist angles with varying flow coefficients. The observed optimum twist for the best performance is 9^° for the chosen impeller diffuser configuration.

KEYWORDS
Diffuser, Twist, Stagger Angle, Solidity, Efficiency, Static Pressure Recovery Coefficient

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] P.Venkateswara Rao , G.V.Ramana Murty , G. Venkata Rao , "Numerical Studies of Twisted Vaned Diffuser on the Performance of a Centrifugal Compressor Stage," Universal Journal of Mechanical Engineering, Vol. 2, No. 5, pp. 163 - 168, 2014. DOI: 10.13189/ujme.2014.020503.

(b). APA Format:
P.Venkateswara Rao , G.V.Ramana Murty , G. Venkata Rao (2014). Numerical Studies of Twisted Vaned Diffuser on the Performance of a Centrifugal Compressor Stage. Universal Journal of Mechanical Engineering, 2(5), 163 - 168. DOI: 10.13189/ujme.2014.020503.