A turbomachinery is a type of power machinery that uses continuously rotating blades as its main component to convert energy between the fluid working medium and shaft power.

　　 Turbomachinery A turbomachine is a type of power machinery that primarily relies on continuously rotating blades to convert energy between the fluid working medium and shaft power.

　　According to the direction of fluid motion, flows can be classified into axial flow, radial flow, mixed flow, and combined flow. Generally speaking, axial-flow pumps have high efficiency and large flow rates but relatively low pressure ratios (expansion ratios); radial-flow pumps have slightly lower efficiency and flow rates, but their pressure ratios (expansion ratios) are higher.

　　By function, they can be classified into prime movers—such as steam turbines and gas turbines—that convert energy into mechanical work; and working machines—such as pumps, fans, compressors, propellers, and the like—that perform specific tasks (with power consumption).

　　Common working fluids include air, water, hydrogen, ammonia, carbon dioxide, and others. Different working fluids exhibit distinct turbine characteristics.

　　Power machinery and fluid machinery are two distinct disciplines under the fields of power engineering and engineering thermophysics. Their applications are extremely broad, encompassing compressors, turbines, and rotors used in military aircraft and marine engines; marine propellers; pumps, fans, steam turbines, wind turbines, and hydro turbines in power generation systems; turbines employed in the refrigeration industry, which serve as both compressors and expanders; and, in the chemical industry, compressors, fans, and turbines often rank among the most critical and essential components in these industries.

　　A turbomachine is a type of power machinery that uses continuously rotating blades as its primary component to convert energy between the fluid working medium and shaft power. Unlike reciprocating piston machines, which seal the working medium within a variable-volume space, turbomachines are in open communication with the surrounding environment. As a result, they possess greater flow capacity than their reciprocating counterparts, providing an effective pathway for significantly boosting machine power output. In a broad sense, turbines encompass prime movers such as gas turbines, steam turbines, wind turbines, and hydro turbines, as well as working machines like blowers and pumps. In a narrower sense, turbines typically refer specifically to gas turbines and steam turbines that use compressible fluids as their working media.

　　Adhere to the continuity equation, momentum equation, angular momentum equation, and energy equation from fluid mechanics. In the design process, velocity triangles and Euler’s equations are often employed for preliminary design. The ternary flow theory (S1S2 stream surface theory), proposed by Chinese scientist Professor Wu Zhonghua, represents a milestone in the field of turbomachinery and has greatly facilitated the development of turbomachinery; it remains widely applied even today. Nowadays, advances in CFD technology have made turbine design significantly easier. However, traditional design methods are still in use because CFD requires considerably more time.

　　Impeller machinery is a comprehensive engineering discipline that encompasses multiple fields, including fluid mechanics, engineering thermodynamics, computational fluid dynamics, gas dynamics, heat transfer, structural mechanics, rotor dynamics, materials science, and control science. It also relies on advanced technologies in areas such as machining, sealing, bearings, and measurement. The level of advancement in impeller machinery serves as a key indicator of a country's overall scientific and technological strength.