International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 04 | April-2017
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p-ISSN: 2395-0072
Energy Scenario of a Centrifugal Pump by varying Tip Clearance Paul Gregory F1, Vasanthakumar D1,Geethanjali J1, Muhammed Fazil Mohideen Pitchai2 1PG
Scholar – Energy Engineering, PSG College of Technology, Coimbatore, INDIA (India)–Calipha Umar Research Laboratory- Fort Arumbu, INDIA ---------------------------------------------------------------------***--------------------------------------------------------------------2Director
Abstract –Centrifugal Pumps play a major role in
an energy efficient way. Energy efficiency will directly involve the performance of the centrifugal pump.
household as well as industrial applications. The energy consumption of the centrifugal depends upon its load, type of application and also on the type of impeller used. The energy scenario in centrifugal pumps remains eventful. In an attempt to evaluate the energy performance with the varying tip clearance of the Centrifugal Pump fitted with a semi-open impeller, an experimental analysis has been done and the performance has been observed. The performance test was conducted with varying the discharge of flow as well as the tip clearance of the pump. This pump has been designed with an annular casing. Experimental analysis has been concluded with a thought of the right tip clearance and its effect on the energy scenario of the chose centrifugal pump. The energy scenario was described as a measure of calculating the input and output power.
2. DESIGN OF THE CENTRIFUGAL PUMP 2.1Design of the Impeller
Impellers for pumps can be categorized into three types based on the physical configuration. 1. Closed Impeller 2. Semi-Open Impeller 3. Fully Open Impeller Closed impellers are characterized by front and back shrouds, Semi-open by its back shroud and Fully open impeller by no-shroud. The impellers are shown in Fig.1
Key Words:Semi-open impeller, Tip Clearance.
1. INTRODUCTION (a)
Centrifugal pumps is of inevitable nature as they are being deployed in household, processing industries, agriculture, cleaning and a lot more activities. Parameters of the pump have to be designed in such a way that it should consider the internal flow of the pump. For instance, designing of the impeller of the pump must involve the selection of type of flow [1] and also on the flow characteristics. Centrifugal dynamically moves fluid from one section to another section by the principal of momentum creation [2]. Several researchers have tested the flow through pumps using CFD Analysis [1],[3] but researches for energy consumption remains limited.
In this research work, semi-open impeller has been designed by multiple arc method. The major specifications of the designed impeller include: Number of Blades = 6 Blade inlet angle = 24029’ Blade outlet angle = 270 Shaft diameter for impeller = 25mm A Solid stepped shaft was used to connect the impeller with the motor coupling. The solid shaft assembly consisted of the following components: 1. Solid Stepped shaft of 550mm length. 2. Bearings (ISI25BC03) 3. Plummer Block (MASTA) 4. Motor Couplings (Couplings mating Ф25mm shaft and Ф28mm motor shaft were chosen) The designed impeller was casted and then machined by Vertical milling for to contour out the impeller blades. The model of designed impeller is show in Fig.2
Energy conservation in pumps will definitely lead to an efficient and sustainable environment in industries [8]. Hence it is to utmost importance to operate pumps in |
Impact Factor value: 5.181
(c)
Fig -1: (a) Closed Impeller, (b) Semi-open Impeller, (c) Fully Open Impeller
Any Centrifugal pump would generally have the following main components (a) Impeller, (b) Casing, (c) Foot Valve, (d) Connecting Shaft, (e) Electrical Motor, (f) Suction and discharge pipes. Tip clearance is the distance between the impeller and the casing body. Several researchers [4-7], have tested the effect of tip clearance effects in compressors but the tip clearance research work on pumps remains limited. This research work has tested the energy performance of the pump by varying tip clearance.
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