Design of radial impellers: A combined extended analytical and numerical method

Epple, Philipp; Karic, B.; Ilić, Časlav; Becker, Stefan; Durst, F.; Delgado, Antonio

doi:10.1243/09544062jmes1196

Cited by 13 publications

(11 citation statements)

References 4 publications

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“…A second way to validate the theory is performing CFD computations. How well the design predictions fit to the CFD computations has been already done by the authors and presented in Epple [5] and Epple et al [13,14]. Here, it was confirmed for several practical cases that the design process and hence these simplified formulae, which do not take into account the viscosity, indeed capture the essential physics of the process, failing to lead to the exact value.…”

Section: The Ideal Total-to-static Efficiency and The Cordier Diagramsupporting

confidence: 53%

A theoretical derivation of the Cordier diagram for turbomachines

Epple

Durst

Delgado

2010

Proceedings of the Institution of Mechanical Engineers, Part C:

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Abstract:The design of high-efficiency fans is often based on the experience of the designer. In order to determine its main dimensions, fan designers use the Cordier diagram. For a given operating point (i.e. flowrate and pressure, and a rotating speed), the optimum diameter of highefficiency fans can be found in the Cordier diagram. The Cordier diagram is an empirical diagram based on measurements. It delivers a relation between flowrate, pressure, rotating speed, and diameter. However, the Cordier diagram does not provide any information on the blade shape (i.e. the angles and the blade width). In order to fill this gap, there are design rules based on the experience of the designer and some analytical performance parameters in the literature. One very common performance parameter is the reaction, which is the ratio between the static and the total pressure rising from the impeller inlet to its outlet. These design rules and performance parameters are, however, of limited use. Therefore, the total-to-static ideal efficiency is introduced to yield, together with the speed and diameter numbers σ and δ, the essential parameters that distinguish the different turbomachines in the Cordier diagram. Based on the integral parameters of the flow and the geometry of turbomachines, a performance analysis of turbomachines is performed and the Cordier diagram is theoretically derived.

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Section: The Ideal Total-to-static Efficiency and The Cordier Diagramsupporting

confidence: 53%

A theoretical derivation of the Cordier diagram for turbomachines

Epple

Durst

Delgado

2010

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…As a starting point, it was decided to design a model of centrifugal vacuum pump inspired by traditional air suction systems; consisting of a centrifugal impeller driven by a brushless motor that is integrated into a housing. To carry out the design of the main parts, diverse results extracted from [21], [22] and [23] are integrated, since the existing relationships between the different geometric parameters of the rotor and the physical variables of interest are evidenced.…”

Section: Tbp Designmentioning

confidence: 99%

“…For this reason, the method is often referred to as "frozen rotor" [26]. According to Epple [22], the frozen rotor model has the advantages of being robust, using less computational resources than other frame change models, and being well suited for high blade counts. The main disadvantage of using this model is that it cannot model the transient effects at the frame interfaces.…”

Section: Boundary Conditions Definitionmentioning

confidence: 99%

CFD Modelling and Optimization Procedure of an Adhesive System for a Modular Climbing Robot

Hernando¹,

Gómez²,

Brunete³

et al. 2020

Preprint

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Adhesion systems are very important in robots for infrastructure inspection (especially in vertical walls). They present the challenge of optimizing the ratio vacuum/power consumption in battery-powered robots. In this paper a CFD (Computer Fluid Dynamics) modelling and optimization process of a robot adhesion system is carried out to determine the best performing configuration in terms of vacuum and power consumption. Analytical and numerical models were developed to predict the behaviour of the system for different configurations. The models were validated, using test rig measurements, by calibrating an arbitrary defined inlet height that simulates the leakage flow. Then, different geometric parameters were varied to determine the best performing configuration based on the vacuum/power consumption ratio value. The model presented in the paper was capable of predicting the behaviour of the system for different configurations, with a margin of error of 15% for the vacuum prediction and a 25% for the motor power calculation. Finally, the model was used to optimize parameters of the system, like the number of blades of the impeller. The adhesion system was conceived for the modular autonomous climbing legged robot ROMERIN.

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“…The efficiency of the bypass-type motor, which is the simplest combination of fan and motor, can be represented by the multiplication of the fan and motor efficiencies as in equation (7). Equation 7shows that the characteristic variables for the fan-motor performance are input power (P in ), speed of rotation (N), torque (T), pressure (P), and flow rate (Q).…”

Section: Motormentioning

confidence: 99%

“…There has also been some research on the prediction of performance considering both the fan and the motor. Epple et al 7 used mean line analysis with the torque-speed characteristics of the motor, and predicted fan performance considering the effect of variation of the rotational speed on the flow rate of the impeller. The performance of the fan-motor was predicted under free delivery condition, combining the motor and fan characteristics from a single-point impeller test, to determine the optimal combination of the two.…”

Section: Introductionmentioning

confidence: 99%

Methodology for system-level analysis of a fan–motor design for a vacuum cleaner

Park

Jun

Park

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present study, a methodology for conducting a system-level analysis of a fan–motor assembly in a vacuum cleaner is presented. This system consisted of three components, a fan, motor, and the flow resistance of the motor, or of the vacuum cleaner. The combined characteristics of the fan and the motor were obtained from torque matching at a constant throttling condition, and a pressure drop was implemented under a constant flow rate to account for the flow resistance. By combining these two steps, the performance characteristics of the fan–motor assembly and the vacuum cleaner system could be predicted over the whole range of operation, based on the characteristics of each component. The predicted performance for power, flow rate, pressure, and efficiency using the present method agreed well with the experimental results obtained for an equivalent system, within 2% difference at best efficiency point. Three models of the fan–motor assembly (S1, S2, and S3) were analyzed at the component level, and the decrease in efficiency produced by flow resistance was estimated to be 1% (S1 and S3 models) or 4.7% (S2 model) using the present method. The characteristics of the fan, extracted from those of the fan–motor assembly, were used for validating the computational fluid dynamics. The computational fluid dynamics results of this study predicted higher efficiency due to simplification of the geometry, but an accurate prediction of best efficiency point location was obtained. The proposed method is also applicable for detecting system leakage and identifying system resistance without direct measurement.

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Design of radial impellers: A combined extended analytical and numerical method

Cited by 13 publications

References 4 publications

A theoretical derivation of the Cordier diagram for turbomachines

A theoretical derivation of the Cordier diagram for turbomachines

CFD Modelling and Optimization Procedure of an Adhesive System for a Modular Climbing Robot

Methodology for system-level analysis of a fan–motor design for a vacuum cleaner

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