Flow Studies on a Centrifugal Compressor Stage With Low Solidity Diffuser Vanes

Mukkavilli, Prasad; Raju, G. Rama; Dasgupta, A.; Murty, G. V. Ramana; Chary, K. V. Jagadeshwar

doi:10.1115/gt2002-30386

Cited by 7 publications

(7 citation statements)

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“…The optimum solidity for the chosen impeller diffuser combination was found to be 0.81, as reported by Prasad et al [11]. The performance of the compressor stage with an optimized LSD solidity of 0.81 and the five setting angles mentioned above is presented in this paper.…”

Section: Resultssupporting

confidence: 70%

“…Fifteen sets of LSD vane configurations covering three solidities, (0.69, 0.81 and 0.93) and five setting angles (16, 20, 24, 28 and 328) were experimentally investigated downstream of the given impeller. The optimum solidity for the chosen impeller diffuser combination was found to be 0.81, as reported by Prasad et al [11]. The performance of the compressor stage with an optimized LSD solidity of 0.81 and the five setting angles mentioned above is presented in this paper.…”

Section: Resultssupporting

confidence: 70%

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Effect of the setting angle of a low-solidity vaned diffuser on the performance of a centrifugal compressor stage

Reddy¹,

Murty²,

Mukkavilli

et al. 2004

Proceedings of the Institution of Mechanical Engineers, Part A:

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The present investigation is undertaken to study the performance of an existing stage of an industrial centrifugal compressor with a vaneless diffuser and is aimed at improving the efficiency of the compressor stage through the use of a low-solidity (LSD) vaned diffuser. The experiments were conducted at a tip Mach number of 0.35. The LSD vane is formed from a standard aerofoil profile with marginal modification in the trailing edge region. The study was conducted at a solidity ratio of 0.81, which is considered as the optimum for the chosen stage. The overall stage performance for different diffuser vane setting angles was evaluated in terms of flow coefficient, head coefficient, polytropic efficiency and static pressure recovery coefficient. The performance parameters are normalized with respect to those of the vaneless diffuser at design flow. Improvement in performance as well as static pressure recovery was observed with LSD vanes as compared with a vaneless diffuser configuration. Variation in blade loading was studied from measurements of static pressure on the pressure and suction surfaces of LSD vanes at different vane setting angles. It was observed that the vane setting angle has a significant effect on stage performance and also on the blade loading.

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Section: Resultssupporting

confidence: 70%

Section: Resultssupporting

confidence: 70%

Effect of the setting angle of a low-solidity vaned diffuser on the performance of a centrifugal compressor stage

Reddy¹,

Murty²,

Mukkavilli

et al. 2004

Proceedings of the Institution of Mechanical Engineers, Part A:

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show abstract

“…In order to improve the performance of the diffuser, the boundary layer thickness must be effectively controlled to reduce the separation loss as much as possible. The popular methods currently used for reducing the flow loss include low solidity diffuser (Mukkavilli et al 2002), adjustable vane (Xi et al 2006), tandem cascade (Zhao and Wang 1997) and boundary layer suction technique (Zhao et al 2009) et al, mainly concentrating on the shape modification of the diffuser vane. However, these methods induce the extra complexity of the vane configuration, which could be a challenge for the diffuser design and manufacture.…”

Section: Introductionmentioning

confidence: 99%

CFD Investigation on the Application of Optimum Non-Axisymmetric Endwall Profiling for a Vaned Diffuse

Fan

Wang³

2018

JAFM

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In order to improve the performance of a transonic centrifugal compressor stage, non-axisymmetric endwall profiling optimization was conducted for the diffuser under design condition, Artificial Neural Network (ANN) and Genetic Algorithm (GA) were used to execute the optimization with the objective of maximizing the isentropic efficiency of the compressor stage. The influence mechanism of non-axisymmetric endwall profiling on flow field and performance was discussed. Results show non-axisymmetric endwall profiling is an effective way to significantly reduce the flow loss in the diffuser. The total pressure loss of the diffuser decreases by 9.31% and 20.29% for NA0.70 and NA1.40 respectively. The profiled endwall suppresses the flow separation through accelerating the low-energy flow and reducing lateral pressure gradient. The corresponding high vorticity within the flow separation zone is reduced, which delays the formation and development of the flow separation. The diffuser becomes more fore-loaded, the overall blade loading is not affected, and the pressure ratio of the compressor stage is improved as well. At the outlet of the diffuser, the more uniform flow angle and much lower total pressure loss along spanwise are obtained. However, the backflow with high velocity gathering near the shroud of the diffuser makes the mass flow rate decrease and easily induce the stall, which results in the smaller operating range for both profiled endwall.

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“…To satisfy x Pareto 2 X, the design parameters are statistically analyzed based on a large number of research literature, 6,9,10,16,18,26,28,[38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55] as shown in Figure 7.…”

Section: Design Spacementioning

confidence: 99%

Intelligence design method for three-dimensional vaned diffusers in a centrifugal compressor

Wang

Wen

Wang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents a multi-objective optimization-based intelligence design method for the design of the three-dimensional vaned diffuser for a given centrifugal compressor. This design method consists of three-dimensional vaned diffuser design model and its solving strategy. The three-dimensional vaned diffuser design model consists of the diffuser geometry mathematical model, performance evaluation model, objective equation, and design space. The diffuser geometry is described by the mathematical model of the meridional configurations and vane camber, trailing edge lean, and thickness. The generic design space is determined through literature statistical investigation. An NSGA-II multi-objective optimization algorithm, utilized to solve the three-dimensional vaned diffuser design model, directs the diffuser geometry variables to achieve the maximum stage isentropic efficiency and static pressure ratio at the design point within the design space automatically and intelligently. The presented three-dimensional vaned diffuser design method is demonstrated using a case test for a centrifugal impeller. The convergence of evolutionary solving for this three-dimensional vaned diffuser model is analyzed in detail, which provides the convergence reference for engineering applications. Three representative three-dimensional vaned diffusers on Pareto front are utilized to check the diversity of geometry shape and overall range performance characteristics. The results show that the three-dimensional vaned diffuser design method established here has excellent potential in automated design and maximizing stage performance. The method reported here could provide a valuable reference for the intelligent design of radial turbomachinery diffusers.

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Flow Studies on a Centrifugal Compressor Stage With Low Solidity Diffuser Vanes

Cited by 7 publications

References 0 publications

Effect of the setting angle of a low-solidity vaned diffuser on the performance of a centrifugal compressor stage

Effect of the setting angle of a low-solidity vaned diffuser on the performance of a centrifugal compressor stage

CFD Investigation on the Application of Optimum Non-Axisymmetric Endwall Profiling for a Vaned Diffuse

Intelligence design method for three-dimensional vaned diffusers in a centrifugal compressor

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