3 results about "Oscillating flow" patented technology

The application discloses a pulsating heat pipe heat transfer model and a calculation method based on oscillating flow characteristic number, and belongs to the technical field of heat exchange equipment, and comprises the following steps: establishing a pulsating heat pipe model, determining working medium and evaporation section and condensation section temperature; taking initial amplitude, initial frequency, initial liquid film thickness and initial bullet temperature as assumed parameters, solving liquid bullet temperature distribution through a liquid bullet energy equation; constructing a liquid bullet motion equation based on the initial amplitude and the initial frequency, calculating liquid bullet displacement and combining the initial bullet temperature to calculate bullet pressure; calculating bullet temperature according to bullet pressure and performing iterative correction; updating liquid bullet temperature distribution according to the corrected bullet temperature and calculating liquid film theoretical thickness, and performing iterative correction; based on the oscillating flow Nusselt correlation, the initial amplitude and the initial frequency are iteratively corrected, and the sensible heat and the flow thermal resistance are calculated according to the iteratively converged parameters. The application discloses the correlation between the oscillating flow characteristic number and the heat transfer performance, and provides reliable data support for heat pipe design.

This invention provides a hydraulically driven self-excited oscillating nozzle. As a novel device that optimizes water spraying performance by relying on the self-excited oscillation effect of fluid, this nozzle aims to solve the problems of limited spray range and uneven coverage caused by high jet concentration in traditional nozzles. Its core structure integrates a self-excited vibration resonant cavity and an oscillating flow channel. During operation, the pressure pulsation formed by water flowing through the special flow channel couples with the resonant cavity, causing the ejected jet to undergo radial diffusion and pulsation breakup under the action of self-excited oscillation, significantly enhancing the jet's spreading ability. Compared to traditional nozzles, this type of nozzle not only retains the advantages of small atomized particle size, low energy consumption, compact structure, and no need for an external power supply, but also achieves a significant expansion of the spraying range. It provides key equipment support for efficient, water-saving, large-area water spraying technology and has significant practical implications for improving water spraying efficiency and reducing water consumption.

This invention relates to the field of thermoacoustic power generation technology, and provides a turbine power generation system driven by a thermoacoustic engine rectification, comprising: a thermoacoustic engine for converting thermal energy into reciprocating oscillating flow of a working fluid to generate acoustic energy; a rectifier module, with its input end coupled to the output end of the thermoacoustic engine, for rectifying the acoustic energy of the reciprocating oscillating flow into steady-state DC; and a turbine power generation module, with its input end coupled to the output end of the rectifier module, for receiving the steady-state DC and converting the mechanical energy in the steady-state DC into electrical energy through a thermodynamic cycle. This configuration effectively solves the problem that existing thermoacoustic linear generators are limited by power density and amplification capabilities, making it difficult to meet the demands of high-power power generation. It also reduces manufacturing costs. Furthermore, by replacing the compressor in a Brayton cycle power generation system with a thermoacoustic engine, it reduces rotating parts in the compressor, lowers maintenance requirements, improves system reliability, and facilitates higher thermoelectric conversion efficiency and wider heat source adaptability.