Fluid Mechanics: Open Access

A pump-jet is made up of a rotor, a stator and a duct. It is used on underwater vehicles for everything from deep sea exploration to mine clearing. It has high critical speed, high propulsion efficiency, great anti-cavitation performance and low radiated noise. The high degree of coupling with the appendage and the complex interaction of the flow field between the various components necessitate extensive research on the hydrodynamic performance and flow field for application and design. There is a dearth of research on pump-jet performance and optimal design due to its initial military application and complex structure. The pump-jet hydrodynamic performance, noise performance, flow field characteristics involving cavitation erosion and vortices properties of tip-clearance, the interaction between the rotor and the stator and the wake field, as well as the optimal design, are summarized in this paper in a comprehensive and specialized manner. The design method, as well as the advantages and range of applications of numerical and experimental methods, are discussed. In addition, it provides a vision for future research and draws a conclusion regarding the primary difficulties encountered in application. The pump-jet was found to be significantly different due to its compact structure and intricate internal and external flow fields, resulting in improved performance. Vortices are the focus of research on cavitation because they interact with the complex pump-jet structure, causing flow field instabilities like vibration, radiated noise and cavitation erosion. The sawtooth duct is installed and the tip clearance is removed in order to effectively reduce radiated pump-jet with minimal impact on hydrodynamic performance. With promising prospects, cutting-edge optimal technology is capable of achieving high cavitation and acoustic performance. The primary focus of future research ought to be on further advancements in pump-jet research and application in the multidisciplinary integration of fluid dynamics, acoustics, materials, chemistry and bionics.

When a material's inherent property directly converts temperature variations across its body into electric voltage, this phenomenon is known as a thermoelectric effect. The differential operator's non-classical approach is used to predict the thermoelectric fluid's maximum and best heat transfer efficiency in this manuscript. The fractionalized numerical model is likewise settled to investigate the productivity and qualities of thermoelectric liquid through temperature dissemination and speed field. Cardano's method and the comprehensive analytical approach of integral transforms are utilized to provide analytical solutions that incorporate the dynamic examination of the temperature distribution and velocity field. On the basis of magnetization and anti-magnetization, which describe the behavior of sine and cosine sinusoidal waves, a dynamic investigation of the thermoelectric fluid's temperature distribution and velocity field is conducted. The rheological parameter magnetization suggests that the magnetized intensity generates 34.66% of the magnetic hysteresis during the thermoelectric effect when varying magnetic fields are used.