Das erweiterte “Cordier”-Diagramm für Fluidenergiemaschinen und Verbrennungsmotoren

Grabow, Gerd

doi:10.1007/bf02574870

Cited by 9 publications

(6 citation statements)

References 2 publications

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“…Providing high pressure at relatively low flow rates, side channel pumps are often used when choosing between a displacement pump and a centrifugal pump like Grabow [1,2] has shown in Figure 1. In this paper, the efficiency is plotted versus specific speed n q (defined according to Equation (1) instead of the specific speed σ (defined according to Equation (2)) used by Grabow as the specific speed n q is more common in the pump industry.…”

Section: Introductionmentioning

confidence: 99%

Maximum Efficiency Despite Lowest Specific Speed—Simulation and Optimisation of a Side Channel Pump

Mosshammer

Benigni

Jaberg

et al. 2019

IJTPP

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Side channel pumps provide high pressure at relatively low flow rates. This comes along with a quite low specific speed and thus with the known disadvantage of a quite poor maximum efficiency. This paper describes the detailed analysis and optimisation of a typical 1-stage side channel pump with an additional radial suction impeller by means of computational fluid dynamics (CFD) simulations. In a first step, the model was successively generated and it was obvious that it has to contain all details including suction impeller and main stage (both 360° models) as well as the pressure housing and all narrow gaps to provide useful simulation results. Numerical simulations were carried out in a stationary and transient way with scale resolving turbulence models to analyse the components in detail. Finally the CFD-simulations were validated with model tests. For the optimisation process it was necessary to generate a reduced numerical model to analyse the effects of more than 300 geometry variations. The findings were then combined to establish the desired objectives. Finally the best combinations were validated again with the full numerical model. Those simulations predict a relative efficiency increase at best efficiency point (BEP) and part load >30% with respect to all given limitations like identical head curve, suction behavior, and dimensions.

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Section: Introductionmentioning

confidence: 99%

Maximum Efficiency Despite Lowest Specific Speed—Simulation and Optimisation of a Side Channel Pump

Mosshammer

Benigni

Jaberg

et al. 2019

IJTPP

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“…This figure also contains data of non-regenerative flow machines and these points have been extracted from Grabow. 67 Data related to scroll compressors is obtained from Thomas et al 68 Both Grabow 67 and Thomas et al 68 computed specific speed and diameter as shown below…”

Section: Design and Performance Evaluationmentioning

confidence: 99%

“…These equations are different from equations (10) and (11) and hence the specific work 'w' in equations ( 12) and ( 13) has been re-written in terms of 'head'. Accordingly, the points from 67 and 68 have been modified before plotting in Figure 10. Data for screw and piston compressors has been obtained from Bla´ha and Smid.…”

Section: Design and Performance Evaluationmentioning

confidence: 99%

Regenerative flow pumps, blowers and compressors – A review

Sreekanth

Sivakumar

Kumar

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents a detailed and objective review of regenerative flow turbomachines, namely pumps, blowers and compressors. Several aspects of turbomachines like design and operating parameters, working principle, flow behaviour, performance parameters and analytical and Computational Fluid Dynamics (CFD) related details have been reviewed and summarized. Experimental work has been put in perspective and the most useful results for optimized performance have been presented. Consolidated plots of specific speed-specific diameter have been plotted which can be helpful in the early stages of design. Industrial outlook involving details of suppliers from various parts of the world, their product description and applications too are included. Finally, future research work to be carried out to make these machines widespread is suggested. This review is targeted at designer engineers who would need quantitative data to work with.

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“…For the measured operating points, the flow rate is in a range of 50 m 3 h −1 up to 350 m 3 h −1 with an inverse pressure range of 35,000 Pa down to 1000 Pa. Higher heads exceed the stall line for the given rotational speeds. The dimensionless characteristic behavior is given in the style of the Cordier-Chart [1] in Figure 8(b) and demonstrates that side channel machines cover the operating range between the classical turbomachines and the displacement pumps. The pressure measurements on the blade surface and side channel wall were made for the given characteristic curves.…”

Section: Characteristic Curvementioning

confidence: 99%

“…Side channel blowers close the gap between the classical turbomachines, like axial and radial fans, and the displacement pumps [1]. To characterize the operating point of turbomachines, two basic parameters are commonly used: the flow coefficient * =…”

Section: Introductionmentioning

confidence: 99%

Wall Pressure and Blade Surface Pressure in a Side Channel Blower

Münsterjohann

Becker

2018

International Journal of Rotating Machinery

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In side channel blowers, the pressure field is the result of complex, inner flow mechanisms. While there are already experimental investigations on the wall pressure distributions, little is known about the pressure in the rotating system, i.e., on the blade surface. In this work, we present an experimental setup for measuring the unsteady blade surface pressure in several positions. The acquired data will be complemented by and compared to the additionally measured wall pressure on the side channel housing. Miniature pressure sensors are integrated into the impeller. It is modified to ensure flush mounted membranes of the sensors and to avoid impacting on the flow field. A telemetric system is used for a wireless transfer of the data from the rotating system to the data recorder. As a result, we show the time-resolved pressure distribution as well as its phase-locked ensemble average. The variations of the pressure field are related to the integral pressure difference across the turbomachine and to its rotational speed. Due to the high temporal resolution of the measurement data, an exact spatial localization of crucial flow phenomena is achieved. Low integral pressure differences show a nearly linear increase of the pressure in circumferential direction, while greater integral pressure differences evolve exponentially over the azimuth. The results confirm the circulatory flow theory. Different rotational speeds elicit a comparable behavior. The stripper is a dominant source for pressure fluctuations. Its individual geometric discontinuities are correlated to the flow field. Our results provide a deeper understanding of the flow phenomena in side channel blowers and the theory of pressure generation. Although the measurements were performed for only one type of side channel blower with a double-flow configuration and open blades, the energy transfer mechanism is the same for other modifications like single flow or closed blade versions.

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Das erweiterte “Cordier”-Diagramm für Fluidenergiemaschinen und Verbrennungsmotoren

Cited by 9 publications

References 2 publications

Maximum Efficiency Despite Lowest Specific Speed—Simulation and Optimisation of a Side Channel Pump

Maximum Efficiency Despite Lowest Specific Speed—Simulation and Optimisation of a Side Channel Pump

Regenerative flow pumps, blowers and compressors – A review

Wall Pressure and Blade Surface Pressure in a Side Channel Blower

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