Biomass size reduction is an important step in biomass densification and this article reviews reduction studies. Hammermilling technology had the advantage of low maintenance over other methods including crushing, shearing and rollermilling. A review of equipment design parameters showed that hammermill tip speed, power requirements, grinding rate, screen size, and clearance affect performance ...

tip leakage loss introduces major part of losses of the rotor in axial gas turbines. therefore, the rotor blade tip has a considerable effect on rotor efficiency. to understand the flow physics of the rotor tip leakage, we solve the flow field for different tip platforms (passive flow control) and by considering coolant tip injection (active flow control). various blade tip configurations such ...

A small-scale organic Rankine cycle (ORC) with kW-class power output has a wide application prospect in industrial low-grade energy utilization. Increasing the expansion pressure ratio of ORC is an effective approach to improve efficiency. However, there lack suitable expander for that can operate high efficiency under condition large and small mass flow rate. Aiming at design high-efficiency a...

Abstract A novel non-contact detecting method of aero-engine blade tip clearance based on an optical fiber sensing system is presented. To eliminate the sensor measurement error caused by slight change reflectivity value mechanical end face when light source angle fluctuates and rotates, a three-coil coaxial bundle proposed. Relevant experimental results show that has advantages high sensitivit...

Abstract The efficiency, pressure ratio, and shaft power of a fan depends on type, size, working medium, operating condition. For acceptance tests, dissimilarity in Reynolds number, Mach relative roughness, blade tip clearance the scaled model prototype is unavoidable. Hence, efficiency differs between prototype. This difference quantified by scaling methods. article presents validated physics ...

Tip leakage loss introduces major part of losses of the rotor in axial gas turbines. Therefore, the rotor blade tip has a considerable effect on rotor efficiency. To understand the flow physics of the rotor tip leakage, we solve the flow field for different tip platforms (passive flow control) and by considering coolant tip injection (active flow control). Various blade tip configurations s...

A bi-directional pump is designed by using S-shaped hydrofoil, the most convenient way to achieve operation. In this paper, high-speed photography used visualize flow field characteristics of bidirectional under different cavitation numbers, and changes caused are quantitatively analyzed in combination with pressure pulsation sensor. The results show that operation efficiency reverse lower than...

As a new type of waste heat conversion machine, the roots power machine can convert low-quality resources that are difficult to use into mechanical energy. In order study influence tip clearance and radial on experimental studies were conducted with having different combination clearances their performance was examined. A parametric undertaken using CFD find sensitivity these in influencing ran...

Internal steam leakage in turbines from the high-pressure side to low-pressure through clearances causes loss, resulting reduced efficiency and potentially compromising safe operation of turbine. Therefore, a comprehensive understanding flow characteristics blade tip is crucial improve turbines. In this paper, last stage blades cylinder certain 600 MW ultra-supercritical turbine unit were studi...