Fluid Mechanics Lab Equipment

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Features:

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• Highly reliable
• Safe use

• Item Code: H-16

AIM: To Determine the coefficient of discharge of different notches.

APPARATUS:

 Different types of notches like V-Notch, Rectangular Notch etc. and collecting tank, Stop watch, scale, water channel.

THEORY:

 Notch is a structure which is used to measure the rate of flow in canal, streams and channels. The flow of water in the canals is obstructed by notch structure. This will cause rise of water on upstream side of notch and head builds above sill level of notch. This causes the flow over notch. By principle, the kinematic head is converted into static head and again it converts into kinetic head.

EXPERIMENTAL SETUP:

The experimental setup consists of supply tank with perforated sheets placed near inlet valve to reduce the velocity of incoming water and to reduce the velocity of approach. Thus the perforated sheet can reduce eddies and steady flow can be obtained in the channel.

The notches are fitted in interchangeable groove at the front end of the channel. A collecting tank is provided to measure the actual discharge.

TYPE                                 : RECIPROCAING TYPE

STAGE                              : TWO STAGES                                

CYLINDER                       : TWO CYLINDERS

LP CYLINDER BORE      : 60.33mm

HP CYLINDER BORE     : 57 mm

STROKE LENGTH           : 62mm

MOTOR TYPE                  : IND.MOTOR

MOTOR RATING             : 2 HP

MOTOR SPEED                : 1440 rpm

COMPRESSOR SPEED    : 740 rpm

ELECTRICAL SUPPLY   : 415v/380v, 3Ph,50 Hz

TYPE OF STARTER         : DOL

BELT SIZE                         : A68

TYPE OF LUBRICATION: SPLASH

TYPE OF COOLING         : AIR COOLED

TYPE OF FAN                   : FORCED DRAUGHT

TEST RIG DETAILS:-

1.      Double stage centrifugal pump with motor and provided with energy meter.

2.      Collecting tank with piezometer and graduated scale.

3.      Discharge control valves and pressure gauges.

AIM:- To study the performance characteristics of a Pelton wheel and to draw the main and operating characteristic curves.

INTRODUCTION:- Pelton wheel turbine is a tangential flow impulse turbine used for high head conditions. Water is made to pass through a set of nozzles wherein the high pressure energy is converted into kinetic energy. High velocity water jet is made to impinge on a set of cups mounted on the periphery of a wheel (runner). The cups have a double semi-ellipsoidal shape to avoid axial thrust and are provided with a notch at the bottom to optimize time of energy transfer. In this test rig the output is measured by a brake drum dynamometer coupled to the turbine. The input power to the turbine is calculated by means of a Venturimeter to measure discharge, and a pressure gauge to measure the inlet pressure to the turbine

TEST RIG DETAILS:-

1.      Pelton wheel with rope brake dynamometer.

2.      Pressure gauge to measure turbine entry pressure.

3.      Storage tank with centrifugal pump powered by a motor.

4.      Venturimeter with pressure gauges.

SPECIFICATIONS:-

·         Weight of the hanger W = 1 kg

·         Brake drum dynamometer D =

·         Rope diameter = d =

Venturimeter Details:

1.      d₁ = Diameter of the pipe [mouth diameter of the Venturimeter] =

2.      d₂ = Throat diameter =

3.      a₁ = Area of the pipe =

4.      a₂ = Area of the throat =

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SPECIFICATIONS:

PUMP                  :                  (1) double acting, single cylinder.

                                                (2) Dia of piston =40, stroke =45

                                                (3) Maximum speed = 600 RPM (max)

                                                (4) Connected to the AC motor through

                                                      V-Belt drive and step cone pulley.

                                                (5) Maximum horse power of the primover

                                                      Capacity required =1.0 HP

                                                (6) Maximum head: 30 mts (3 kg/ cm²)

                                                (7) Maximum flow rate: 28.83 LPM

MOTOR            :        (1) DC Motor – 1.0 HP, 1500 RPM

                                             (2)Maximum Current: 2.7 Amps

                                                 Dc drive for speed controller