Features of measurements the IR radiation power of a laser diode used in active optoelectronic systems for studying flows

In active optical-electronic systems for stream research that regulate thermal-physical parameters of diagnosed stream volume, the controlled source of the heat flow can be acquired by radiation of high-power IR laser diodes into the void. In the current work the peculiarities of measurement of this radiation are considered, specified by its strong divergence. It is shown that the measurements can involve laser wattmeters IMO-4M with planar thermoelectric primary measuring transformers of the laser radiation with a flat receiving site provided.

Mathematical model of technological mode on-line control at blade processing

There are formed regression models defining micro-geometrical parameters correlation of the surface obtained as a result of turning and milling with technological modes, mechanical characteristics of structural material and thermal-physical parameters of materials of the “blank-tool tip” contact pair. A comparative analysis of adequacy and accuracy of design dependences used for technological pre-production and formation of the systems for machining adaptive control in digital production systems.

Calculation of Temperature in Fracture for Carbon Dioxide Fracturing

Summary Carbon dioxide (CO2) temperature-field models in the wellbore and fracture are proposed to calculate transitions of fluid-phase states and variations of the fluid thermal-physical parameters during CO2 fracturing. The models take two items into account in the formula of the specific enthalpy: the internal energy and the flow work. The flow work is usually ignored for conventional hydraulic fracturing. When computing the CO2 temperature at the bottom of the hole, we find a 3.8°C deviation (well depth of 2000 m, injection temperature: –20°C) if the effects of the flow-work variations on the fluid temperatures are ignored. The phase states of CO2 vary from liquid to the supercritical state, and the position of the phase-state transition moves from inside the wellbore to the fracture. The fluid temperatures in the wellbore and fracture drop rapidly, whereas the pressures rise gradually. The temperature differences between the fracture fluid and the matrix-leakoff zone are small, and the cooling-formation distance increases with time and the injection rate.

The Establishment and Application of 316LN Stainless Steel Database for AP1000 Primary Coolant Pipes

Nuclear grade 316LN austenitic stainless steel (ASS) with an exceptional combination of mechanical properties and corrosion resistance was used to produce AP1000 primary coolant pipe. In order to evaluate the microstructure evolution of the pipe during its forging process, the material database of the 316LN ASS is established with high integrity and reliability. In this paper, the thermal physical parameters, flow stress-strain data and the recrystallization kinetic equations of the 316LN steel are coupled, and the material database is systematically established. Most important, the reliability of the database is verified by an experiment.

Numerical Simulation of Temperature Field of Gears in Quenching Process

Combining with change of the thermal physical parameters of materials, the temperature field of 45 steel gears in quenching processes has been numerically simulated using the thermal analysis module of ANSY Workbench software. The relationship between temperature of gears parts and quenching time has been achieved, the simulation results are consistent with actual process. The methods is superior to the traditional manual measuring and experience judgment way. The simulation process has provided the due theoretical basis for the calculation of parts thermal stress and residual stress in quenching process.

Research of Groundwater Heat Source Pump in the Cold Region

A certain scale underground permafrost is chronically existing in northeast certain regions,thus forming an nature cold source and thats has a great influence on the application of groundwater source heat pump. In order to improve operational efficiency of groundwater source heat pump,the paper uses laboratory and field test and numerical simulating method to probe into influence rule of cold source on groundwater heat source pump. Author carried on thermal physical experiments and field thermal response tests of the cold source site for Jiagedaqi region. Study has shown that thermal physical parameters of sand and gravel (specific heat capacity,thermal conductivity) present discrete phenomenon with the depth in the region,thermal physical parameters of sandstone and granite have little change,thermal conductivity of granite is largest and sand and gravel is smallest and sandstone is placed in the middle,specific heat capacity has obvious fluctuation for the depth influence,specially for sand and gravel layers on the different depth. Based on geological conditions,the paper constructs numerical model and carries out numerical research,and then simulates and analyzes heat breakthrough and influence radius of pumping/injecting system of multiple well,simulating results show that influence range of cold source should be within 150m to multiple well and cold source has the greatest effect on water source heat pump less than 75m. Research results will provide theoretical basis and reference for groundwater source heat pump designing and site selection.

Numerical Simulation of Temperature Field of Low Alloyed Bainite Ductile Iron in Austempering

It has an great significance for making heat treatment technology by researching the law of temperature variations of ductile iron in austempering. Based on the three-dimensional finite element method (FEM), the temperature variations of low alloyed bainite ductile iron in austempering are studied in this paper. The temperature relativity of the thermal physical parameters is considered during building the model. The simulation result demonstrates that during the stage of rapid cooling, the cooling speed of the surface is faster than that of the center, and the whole cooling speed increases firstly, then decreases. During the stage of isotherm, the surface temperature of the sample increases to the isothermal temperature directly, while the center temperature decreases firstly, then increases, until to the isothermal temperature.