Fluids Air compressor prac

Topics: Thermodynamics, Pressure, Compression Pages: 4 (370 words) Published: September 21, 2013


Department of Mechanical Engineering

MEC3033F – Thermofluids II
2013

Fluids Lab 1 – Pelton Wheel

Date of submission: XX April 2013

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Student No.
Initials
Surname
Signature

MEC 3033F
THERMOFLUIDS II
LABORATORY 1
AIR COMPRESSOR

EXPERIMENT PERFORMED BY
WILLIAM LIW TAT MAN
LWTWIL001

Date: 11 March 2013
Aim
The aim of this practical is to examine aspects of a single-stage air compressor. Introduction and theory
In this practical, we need
1. To determine the instantaneous value of the (polytropic)coefficient of compression from the slop of the pressure/volume(P/v) diagram, near the start, in the middle and at the end of the compression. 2. To determine the indicated work/cycle of the compressor from the P/v diagram. Where:

Work/cycle=(m.e.p) x (piston-area) x stroke
And m.e.p= mean effective pressure= average pressure(i.e stroke of the compressor) 3. To determine the volumetric efficiency of the compressor.

A pressure transducer is used so that a potential drop will be created for a change in pressure. A similar process is used to capture the volume being compressed. These voltages are then captured by an oscilloscope with respect to time.

Method
The values of several different readings are noted from the digital display on the control board.

A graph of the voltages corresponding to the pressure is plotted against those corresponding to the volume. The plot obtained is of the same shape as that of a P-v...
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