positive displacement pump and centrifugal pump|positive vs negative displacement pump

The centrifugal fuel pump in this study is a single-stage and single-suction centrifugal pump with a rotational speed of 14,000 rpm that is used to pressurize the fuel in an aircraft engine fuel system. The main hydraulic components of the centrifugal fuel pump consist of an inducer, an impeller, and a volute, which are shown in Fig. 1.

Positive displacement pumps are a type of pump that operates by trapping a fixed amount of fluid and then forcing that trapped volume into the discharge pipe. These pumps are known for their ability to provide a constant flow rate regardless of changes in system pressure. While positive displacement pumps have many advantages, they also come with their own set of disadvantages.

Positive displacement pumps have several advantages over centrifugal pumps, including their ability to handle fluids with high viscosities and solid content and to provide a constant flow rate regardless of the pressure at the pump discharge.

Positive Displacement Pump Disadvantages

One of the main disadvantages of positive displacement pumps is their limited capacity for handling high flow rates. These pumps are best suited for applications that require a steady and consistent flow rather than high-volume pumping. Additionally, positive displacement pumps can be more prone to damage from cavitation, which can occur when the pressure of the fluid drops below its vapor pressure.

Positive Displacement Pump vs. Diaphragm Pump

Diaphragm pumps are a type of positive displacement pump that uses a flexible diaphragm to create a chamber that alternately fills and empties. While both types of pumps operate on the principle of trapping and displacing fluid, diaphragm pumps are typically used in applications where the fluid being pumped is abrasive or viscous.

Positive Displacement Pump vs. Non-Positive Displacement Pump

Non-positive displacement pumps, such as centrifugal pumps, operate by imparting velocity to the fluid to increase its kinetic energy. In contrast, positive displacement pumps use mechanical means to move a fixed volume of fluid. The main difference between the two types of pumps is their ability to handle varying flow rates and pressures.

Peristaltic Pump vs. Positive Displacement Pump

Peristaltic pumps are a type of positive displacement pump that uses a flexible tube to move fluid through a series of rollers. These pumps are often used in applications where contamination or leakage is a concern, as the fluid only comes into contact with the tubing. While peristaltic pumps offer benefits in terms of hygiene and containment, they may not be suitable for high-flow applications.

Centrifugal Pump

Centrifugal pumps, also known as rotodynamic pumps, operate by using a rotating impeller to impart velocity to the fluid. This kinetic energy is then converted into pressure as the fluid is forced through the pump casing and discharged. Centrifugal pumps are widely used in various industries due to their ability to handle high flow rates and pressures.

Positive vs. Negative Displacement Pump

The main difference between positive displacement pumps and centrifugal pumps, which are a type of negative displacement pump, lies in their operating principles. Positive displacement pumps trap and displace a fixed volume of fluid, while centrifugal pumps use velocity to increase the fluid's kinetic energy. This difference results in varying flow rates and pressure capabilities for each type of pump.

Progressive Cavity Pump vs. Centrifugal Pump

Below is a quick comparison table that highlights the main performance differences between centrifugal (rotodynamic) pumps and positive displacement pumps. Impellers pass on velocity from the motor to the liquid …

Upgrade your aquarium's water circulation with the Axis 20 Centrifugal Pump by AquaIllumination. Boasting a flow rate of 185 gallons per hour (GPH), this pump ensures .

positive displacement pump and centrifugal pump|positive vs negative displacement pump