{"id":7027030,"date":"2026-08-04T15:36:48","date_gmt":"2026-08-04T15:36:48","guid":{"rendered":"https:\/\/peraltafinancing.com\/aerospace\/understanding-radial-forces-in-centrifugal-machines-and-why-they-matter-for-reliability\/"},"modified":"2026-08-04T15:36:48","modified_gmt":"2026-08-04T15:36:48","slug":"understanding-radial-forces-in-centrifugal-machines-and-why-they-matter-for-reliability","status":"publish","type":"post","link":"https:\/\/fivemor.com\/?p=7027030","title":{"rendered":"Understanding Radial Forces In Centrifugal Machines And Why They Matter For Reliability"},"content":{"rendered":"


\n<\/p>\n

\n

Radial forces are the load acting on a centrifugal machine\u2019s impeller that are directed toward the axis of shaft rotation, and generally consist of a steady component with a superimposed pulsating component. When radial forces are present, they often result in additional stress on the shaft and bearings, leading to accelerated wear, the onset of vibrations, increased seal clearances, and a decrease in overall machine reliability.<\/p>\n

\"Diagram<\/p>\n

Figure 1. Radial Forces acting on the shaft\u2019s center of rotation<\/p>\n<\/div>\n

Radial Force Methodology: Stepanoff, G\u00fclich, and AxSTREAM Methods<\/h3>\n

In the early days of turbomachinery development, engineers noticed bearing wear and shaft deflection, but didn\u2019t have a clear theoretical explanation of what was causing it. They later realized that these issues were linked to radial force, which forms from non-uniform flow.<\/p>\n

Over the years, engineers have developed several different methods for estimating and calculating these radial loads in centrifugal machines to improve the equipment\u2019s lifespan. One method that came about was the Stapanoff\u2019s method, which takes into account the geometric parameters of the impeller and includes an empirical coefficient K, that depends on the operating mode [1]. However, this method is considered rather rough and not sufficiently accurate for today\u2019s standards.<\/p>\n

Then there\u2019s the G\u00fclich calculation model, which accounts for the type of volute and includes a flow-dependent coefficient k. One key advantage of this method is that it provides a much better understanding of how radial loads change under off-design operating conditions [2].<\/p>\n

There are other models that use dimensionless coefficients, which can be useful for comparing pumps or compressors or for analyzing general relationships.<\/p>\n

How to Calculate Radial Forces with AxSTREAM<\/em><\/p>\n

AxSTREAM<\/a>, SoftInWay\u2019s software platform, determines radial force by integrating pressure along the circumference of the volutes. It can calculate for volutes of standard shapes, such as circular or trapezoidal, as well as irregular shapes. AxSTREAM<\/a> also accounts for the interaction between the rotor and the diffuser or between the rotor and the volute [3].<\/p>\n

\"Graphic<\/p>\n

Figure 2. Radial forces determined by different methods<\/p>\n<\/div>\n

Figure 2 shows a comparison of the radial force results determined using the methods mentioned above; the calculations were performed for the single volute centrifugal pump model with impeller diameter D2 = 328 mm and shaft speed = 6000 rpm.<\/p>\n

As a result of one-dimensional calculations in AxSTREAM<\/a>, you can see the static pressure field at the inlet to the volute, the radial force vector, and its components (Fig. 3).<\/p>\n

\"Image<\/p>\n

Figure 3. Static pressure distribution and Radial Force vectors in AxSTREAM<\/p>\n<\/div>\n

How to Minimize Radial Forces<\/h3>\n

Since radial loads are primarily caused by the non-uniform distribution of fluid velocities and pressures downstream of the impeller, the main method for balancing these forces involves making the flow as uniform as possible within the volute.<\/p>\n

Engineers can achieve this in several ways. They can use special types of volutes, such as double-scroll volute or two exit volute. A vane diffuser can also help maintain uniform flow parameters circumferentially, since the diffuser is symmetrical. Optimizing the volute\u2019s shape and the position of the tongue, etc., can further reduce radial forces.<\/p>\n

\"a<\/p>\n

Figure 4. Different volute types: (a) \u2013 single volute, (b) \u2013 double-scroll volute, (c) \u2013 two exit volute<\/p>\n<\/div>\n

Additionally, selecting more wear-resistant materials for the shaft can minimize the negative impact of radial loads on pump operation and help extend the shaft\u2019s service life.<\/p>\n

The Effect of Radial Force on Bearings<\/h3>\n

Radial forces are one of the most common types of loads on bearings. Under a radial load, the bearing rings move relative to one another, generating internal friction. Stress begins to grow in certain areas of the bearing as the radial load increases.<\/p>\n

\"Graphic<\/p>\n

Figure 5. Radial Force acting on the bearing<\/p>\n<\/div>\n

Excessive loads lead to fatigue failure of the bearing rings and rolling elements, shortening their service life, and causing the bearing rings to deform, which can compromise shaft alignment. Increased loads create higher friction, which can cause overheating and may require higher-quality lubricants. For these reasons, when designing and working with bearings, it\u2019s important to pay close attention to the magnitude and distribution of the radial load. Choosing the right bearings helps ensure reliable and uninterrupted operation of machinery and equipment.<\/p>\n

The Importance of Balancing Radial Forces in Centrifugal Machines<\/h3>\n

Balancing radial forces is vital when designing centrifugal machines. Modern analysis methods enable engineers to accurately define a distribution of pressure and velocity along the flow path, as well as the magnitude and direction of the forces acting on the system, including radial loads on the impeller. These capabilities make it possible to identify potentially problematic areas as early as the design stage, perform parametric optimization, and attempt to minimize unfavorable force. Engineers can do this by optimizing the flow path geometry, selecting reasonable design configurations (e.g., the use of double-volute housings or diffusers) and ensuring stable machine operation during real-world operating conditions. SoftInWay\u2019s software platform, AxSTREAM Flow Path<\/a>, enables the evaluation of radial loads in the early stages of design, which can help engineers successfully mitigate the negative impact of these loads on the operation of centrifugal machines and bearings.<\/p>\n

Test out AxSTREAM\u2019s<\/a> new model for calculating radial force with a software trial.<\/a><\/p>\n

References:<\/h3>\n

A. Stepanoff, Centrifugal and Axial Flow Pumps: Theory, Design and Applications, New York: Wiley, 1957.<\/a><\/p>\n

G\u00fclich J.F. Centrifugal pumps, Second edition, Springer-Verlag, Berlin: Heidelberg, 2010.<\/a><\/p>\n

SoftInWay Inc., \u201cRadial Force on Centrifugal Impeller of Compressor and Pump in AxSTREAM\u201d, 2026. [Online]. Available: https:\/\/wiki.softinway.com\/v3.10.9\/softinway-wiki\/axstream-flow-path\/axstream-positive-pressure-gradient-machine\/axstream-ppg-documentation\/radial-force-cc-impeller.md.<\/a><\/p>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"

Radial forces are the load acting on a centrifugal machine\u2019s impeller that are directed toward the axis of shaft rotation, and generally consist of a steady component with a superimposed pulsating component. When radial forces are present, they often result in additional stress on the shaft and bearings, leading to accelerated wear, the onset of […]<\/p>\n","protected":false},"author":1,"featured_media":7027032,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12024],"tags":[188222,11208,6275,13504,190725,16270,5715],"dealstore":[],"offerexpiration":[],"class_list":["post-7027030","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aerospace","tag-centrifugal","tag-forces","tag-machines","tag-matter","tag-radial","tag-reliability","tag-understanding"],"yoast_head":"\nUnderstanding Radial Forces In Centrifugal Machines And Why They Matter For Reliability - Som2ny Network<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fivemor.com\/?p=7027030\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Understanding Radial Forces In Centrifugal Machines And Why They Matter For Reliability - Som2ny Network\" \/>\n<meta property=\"og:description\" content=\"Radial forces are the load acting on a centrifugal machine\u2019s impeller that are directed toward the axis of shaft rotation, and generally consist of a steady component with a superimposed pulsating component. 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