When it comes to fluid dynamics and the engineering of water management systems, the choice of pump can make all the difference. Two types of pumps that are often considered for various applications are axial flow pumps and submersible mixed flow pumps. Both have unique characteristics that make them suitable for different scenarios.

Flow Direction

The flow direction is one of the fundamental differences between axial flow and mixed flow pumps. Axial flow pumps are designed to move fluid primarily in the axial direction, which means the fluid enters and exits the pump along the same horizontal plane. This design is akin to a marine propeller, where the blades of the impeller rotate to push the water forward, making these pumps ideal for applications requiring high flow rates at relatively low head pressures.

In contrast, submersible mixed flow pumps handle fluid in a manner that combines both radial and axial components. The impeller of a mixed flow pump is designed to impart motion to the fluid in two directions, creating a diagonal flow pattern. This dual motion allows mixed flow pumps to provide a balance between high flow rates and moderate head pressures, making them versatile for a variety of applications.

Impeller Design

The design of the impeller is another key differentiator between axial and mixed flow pumps. Axial flow pump impellers typically feature a set of curved blades that are optimized to generate thrust in the axial direction. The blade design focuses on minimizing resistance and maximizing the flow of water, which is why these pumps are often used in applications with largescale water movement needs.

On the other hand, the impellers of submersible mixed flow pumps are designed to create a mix of axial and radial flow. These impellers often have a more complex shape and a greater number of blades to manage the dual flow mechanism. The design ensures that the pump can handle a mix of fluid motion, providing both the thrust to move water and the lift to push against gravity.

Applications of Axial Flow Pump and Submersible Mixed Flow Pump

1.Axial flow pumps are designed to move water or other fluids along the axis of the pump. They are known for their ability to handle large volumes of fluid with relatively low head (pressure) requirements. Here are common applications of axial flow pumps:

Agricultural Irrigation:

Large-Scale Irrigation Systems: Axial flow pumps are used to pump large volumes of water from rivers, lakes, or reservoirs to irrigation systems, especially in agriculture where high flow rates are essential for watering large areas.

Flood Control and Management:

Flood Prevention: They are used in flood control systems to move water away from flood-prone areas and reduce the risk of flooding.

Stormwater Management: Axial flow pumps help in managing and removing stormwater in urban and rural settings to prevent overflow and damage.

Municipal Water Supply:

Water Distribution: In municipal water systems, axial flow pumps are used to move large quantities of water through pipelines to various parts of the distribution network.

Cooling Systems:

Cooling Towers: In industrial and power plant cooling systems, axial flow pumps are used to circulate water through cooling towers and heat exchangers, providing efficient heat dissipation.

2.Submersible mixed flow pumps are designed to operate while submerged in the fluid being pumped. They combine the features of both axial and centrifugal flow pumps, making them suitable for various challenging applications. Here are common uses:

Wastewater Treatment:

Sewage and Sludge Handling: These pumps are used in sewage treatment plants to handle wastewater and sludge with solids. Their ability to handle particulates and solids makes them effective for managing raw sewage.

Stormwater Management:

Flood and Drainage Systems: In stormwater management, submersible mixed flow pumps are used to manage excess water during heavy rains or flooding events. They are effective at removing water from drainage systems and protecting properties from water damage.

Industrial Applications:

Process Water and Slurry Handling: Submersible mixed flow pumps are used in industries to pump process water or slurries containing solids. Their robust design helps in maintaining efficient operation in harsh conditions.

Mining Operations:

De-Watering: These pumps are utilized to de-water mines by removing groundwater and keeping excavation sites dry. They handle water with suspended solids, making them suitable for mining environments.

Specific Speed

Specific speed is a critical parameter that classifies pump types and helps engineers select the appropriate pump for a given application. For lowspeed mixed flow pumps, the specific speeds usually range from 35 to 80 rpm, while higherspeed mixed flow pumps can have specific speeds between 80 and 160 rpm. Axial flow pumps, being designed for highspeed operation, often operate beyond the higher range of specific speeds typical for mixed flow pumps.

The specific speed of a pump influences its performance, efficiency, and the type of flow it can handle. Axial flow pumps, with their high specific speed, are wellsuited for highflow, lowhead applications, whereas mixed flow pumps, with their moderate specific speed, are versatile for applications requiring a balance between flow and head.

Head and Flow Characteristics

The headflow characteristics of a pump describe its ability to move water against a height (head) and the volume of water it can move per unit of time (flow rate). Axial flow pumps are designed to deliver very high flow rates at low to moderate heads, making them perfect for applications like largescale water transfer and flood control.

Submersible mixed flow pumps, however, are engineered to provide a combination of moderate to high flow rates and medium heads. This makes them suitable for applications that require both a significant lift and a substantial volume of water movement, such as in certain irrigation systems or water supply networks.

Submersible Mixed Flow Pump Manufacturers

When it comes to selecting a manufacturer for submersible mixed flow pumps, quality and reliability are paramount. Tianjin Kairun is a name that stands out in the industry, known for its rigorous quality inspections that ensure each pump is defectfree. Their commitment to excellence extends to every aspect of their manufacturing process, from the selection of materials to the final testing of the pumps.

If you are in the market for a submersible mixed flow pump, consider reaching out to Tianjin Kairun. Their team of experts is ready to assist you in making the right choice for your specific needs. Contact them at catherine@kairunpump.com to discuss your requirements and explore how their pumps can be tailored to your project's specifications.

References

[KSB Mixed Flow Pump]

[Liancheng Pump  Mixed Flow vs Axial Flow

[ANDRITZ Submersible Mixed Flow Pump]