The Impact of the Interaction Between Impeller and Spiral Casing on the Performance of Radial Fans

Abstract

In thermal recycling plants high performance fans are needed to transport gas through the process. For this application, the fans have to fulfill very special requirements. The pyrolysis and gasification processes transform different kinds of waste, e. g. biomass and municipal scrap waste, electronic or industrial waste, into highly clean efficient synthetic gas, i.e. usable energy. Therefore, the thermal operating range of these fans lies between ambient temperatures of about 20°C and 530°C. Due to the requirements and design space of the recycling facility, new radial fans were developed according to these particular specifications. Two different impellers were designed with an extended analytical method, as described in Epple et al. [1] and [2]. The first one was designed with a parallel flat shroud and the second one with a conical shroud. In order to fulfill the manufacturer requirements of ease of manufacturing, the impellers were designed with circular arc blades. With these two impellers and at a temperature of 530 °C, as it is needed in the recycling plants, a first Bommes spiral casing was optimized adjusting the spiral casing opening angle and the Bommes parameter, i.e. the ratio of the spiral casing width to the impeller exit width, BSC/b2 (Epple et al. [3]). The results show that the predictions of Bommes work well with impellers with conical shrouds, but for impellers with parallel shrouds the Bommes prediction does not work properly.

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

“…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 housing. To carry out the design of the main parts, diverse results extracted from [ 21 , 22 , 23 ] are integrated, since the existing relationships between the different geometric parameters of the rotor and the physical variables of interest are evidenced.…”

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

“…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.…”