TECH EDUCATION

Positive Displacement Machines More: Screw Pump: Can handle debris Used to raise the level of wastewater Abrasive material will damage the seal between screw and the housing Grain augers use the same principle Rotadynamic Machines (Turbomachines): All rotodynamic machines have a rotating component through which the fluid passes.  In a turbine this is called the rotor which has a number of vanes or blades.   The fluid passes through the blades and drives the rotor round transferring tangential momentum to the rotor Rotodynamic machines are smooth and continuous in action with a consequent pulsation free flow from pumps and smooth rotation from turbines.  In the event of pump discharge flow being suddenly stopped there are no high shock loads.  Positive displacement machines can easily be damaged if a discharge valve is suddenly closed.   Rotodynamic pumps are ideal for high flow low discharge head duties and provide compact reliable solutions. Some...

  Fluid machine may be divided into two groups :  Positive displacement : can produce very high pressures hydraulic fluid pump high pressure water washers                                                 Peristaltic Pump: Fluid only contacts tubing Tubing ID and roller velocity with respect to the tubing determine flow rate Tubing eventually fails from fatigue and abrasion Fluid may leak past roller at high pressures Viscous fluids may be pumped more slowly Gear Pump fluid is trapped between gear teeth and the housing Two-lobe Rotary Pump                                                                  Rotary Pump gear pump with two "teeth" on each Gear Same Principle as ge...

Introduction Of Fluid Machinary: What is Fluid Machine: A fluid machine is a device which converts the energy stored by a fluid into mechanical energy or  vice versa .The energy stored by a fluid mass appears in the form of potential, kinetic and Intermolecular energy.  The mechanical energy, on the other hand, is usually transmitted by a rotating shaft. Machines using liquid (mainly water, for almost all practical purposes) are termed as hydraulic machines. The fluid machines use either liquid or gas as the working fluid depending upon the purpose. The machine transferring mechanical energy of rotor to the energy of fluid is termed as a pump when it uses liquid, and is termed as a compressor or a fan or a blower, when it uses gas. The compressor is a machine where the main objective is to increase the static pressure of a gas. Therefore, the mechanical energy held by the fluid is mainly in the form of pressure energy. Fans or blowers, on the other hand, mainly cause a high fl...

  EXCHANGE OF ENERGY: A machine wherein rotary motion is obtained by centrifugal forces which result from a change in the direction of high velocity fluid jet that issues from a nozzle. A hydraulic turbine uses the potential and kinetic energy of water and convert it into usable mechanical energy. The fluid energy is available in the natural or artificial high level water reservoirs which are created by constructing dams at appropriate places in the flow path of rivers.  When water from the reservoir is taken to the turbine, transfer of energy takes place in the blade passages of the unit. The mechanical energy made available at the turbine shaft is used to run an electric generator which is directly coupled to the turbine shaft.  The power generated by utilizing the potential and kinetic energy of water has the advantages of: High efficiency  Operational flexibility  Low wear and tear  Ease maintenance Despite the heavy capital cost involved in constructi...

  CLASSIFICATION OF FLUID MACHINES: The turbines in general are classified in two ways: According to the direction of flow of water through the runner According to the action of water on the runner blades. In order to classify machines according to the direction of flow of water through the runner, three mutually perpendicular directions for flow of water are chosen RADIAL FLOW MACHINE: The path of water particles is wholly or mainly in the plane of rotation. i.e., the water enters the runner at the outer periphery, flows inwards in the radial direction and leaves at a different radiusas shown in (b) AXIAL FLOW MACHINES: The water mainly flows through the runner in a direction parallel to the axis of rotation as Shown in fig(a). MIXED FLOW MACHINES: The flow in the runner may not be merely in one direction. turbines, water enters radially inwards and emerges out axially so that parallel to the axis of the shaft as shown in fig(d) In mixed flow the discharge in According to the acti...

 Fluid Machines: A fluid machine is a device which convert the energy stored by a fluid into mechanical energy or vice versa. The energy stored by a fluid mass appears in the form of potential, kinetic and intermolecular energy. The mechanical energy, on the other hand, is usually transmitted by rotating shaft. Machines using liquid (mainly water, for almost all practical purpose) are termed as hydraulic machines. In this chapter we shall discuss, in general, the basic fluid mechanical principle governing the energy transfer in a fluid machine and also a brief description of different kinds of hydraulic machines along with their performance.  Fluid Types of Turbines Water Hydraulic Turbine Steam Steam Tubrbine Froen Vapour Turbine Gas Or Air Gas Turbine Wind Wind Turbine Similarly, fluid machines which convert shaft power to fluid power by raising the energy content per unit mass of the fluid are classified as follows:  Fluid Types of Ma...