Home Products News Contact Us
Home > Supports > Generator Sets > Causes of Cavitation Serious Damage to Diesel Generator Sets

Causes of Cavitation Serious Damage to Diesel Generator Sets

Sep. 01, 2023

With the continuous improvement of the effective pressure, rotational speed and specific power of modern diesel generator sets, the specific mass is getting smaller and smaller, the structure is getting more compact, and the wall thickness of the cylinder liner tends to be thinner, which makes its anti-cavitation ability to some extent decrease. We found in the maintenance practice that the cavitation damage of diesel generator sets is very serious. The cylinder liners of many diesel generator sets are not replaced because they exceed the wear limit, but are often forced to be replaced due to cavitation damage.

600KW Yuchai power generator set

Cavitation means that the surface of the outer wall of the wet cylinder liner of the diesel generator set in contact with the coolant is destroyed into some needle-shaped holes, which gradually expand and deepen, and finally form deep holes or cracks; the holes are generally very clean, and there is no corrosion product. The wet cylinder liner is in direct contact with the coolant and is inevitably cavitated gradually; while the dry cylinder liner is not in direct contact with the coolant, the liner seat is also cavitated, and the liner seat is gradually cavitated into through holes or cavities. After the crack, it will further damage the dry liner.

It is generally believed that cavitation is caused by high-frequency vibration of the cylinder liner. The mechanical vibration causes the coolant pressure to change, causing bubbles in the coolant to burst, which is the cause of cavitation. Due to the gas dissolved in the cooling liquid, when the high-frequency vibration of the cylinder reduces the local pressure of the cooling liquid to a certain critical value, the gas dissolved in the cooling liquid is separated in the form of bubbles, and these bubbles flow to the high-pressure area. When the pressure exceeds the bubble pressure, the diesel generator set will collapse.

The gas in the bubble state is re-liquefied or dissolved in the cooling liquid, and the volume is suddenly reduced, and the cooling liquid moves at a high speed to the center of the bubble to produce a water hammer phenomenon, resulting in a great impact force and high temperature, and supersonic speed in the form of a pressure wave. It spreads around, and when it acts on the outer surface of the cylinder liner, it produces great impact, extrusion and high temperature. Under the repeated action of this force, the outer surface of the cylinder liner of the diesel generator set is fatigued and gradually falls off, showing pitting and needle-shaped holes, and gradually expands with the progress of cavitation.

Dingbo Power has advanced testing equipment, modern production technology, professional manufacturing technology, perfect quality management system, and strong technical research and development capabilities. It can provide 3KW~2500KW various specifications of ordinary, automatic, four protection, automatic switching, low noise and mobile generator sets, high quality and low energy consumption to meet the diverse power needs of customers, and can also meet users with different voltages and different frequencies. It is required to create a parallel power supply system for multiple units. If you are interested in our product or any question on generator, welcome to send email to sales@dieselgeneratortech.com.

Contact Us
  • Add.: Room 601, Laboratory Building, No.2 Gaohua Road, Nanning, Guangxi, China.
  • Tel.: +86 771 5805 269
  • Fax: +86 771 5805 259
  • Cellphone: +86 134 8102 4441
                    +86 138 7819 8542
  • E-mail: sales@dieselgeneratortech.com
Follow Us

Copyright © Guangxi Dingbo Power Equipment Manufacturing Co., Ltd. All Rights Reserved | Sitemap


Contact Us