6 results about "Wall effect" patented technology

The present application relates to the field of fluid machinery, and particularly to a water ring vacuum pump impeller and shell line collaborative design method. The method comprises the following steps: impeller and shell line segmentation and control variable setting, based on impeller parameters and four-section shell control parameters to carry out six-factor collaborative design experiment, and using Latin hypercube sampling to obtain sample library; for each group of impeller and shell line control variable combination, using Bezier curve to generate impeller line, and using DFFD method to obtain shell line; for each group of impeller line and shell line, establishing a calculation domain model, using VOF two-phase flow model to carry out CFD calculation, and loading UDF program to calculate wall effect entropy production after the flow field tends to be stable; based on the sample library, constructing a mixed approximation model of wall effect entropy production; under the condition of keeping the rated working condition, using particle swarm optimization algorithm to optimize the impeller and shell line, so as to reduce the wall effect entropy production.

The invention discloses a transition prediction method considering a wall surface heating and cooling effect, which is used for carrying out targeted correction on a simplified stability foundation transition model and expanding the application range of the model to considering the influence of a non-adiabatic wall effect of generalized wall surface heating and cooling. A localized momentum thickness Reynolds number expression and a transition initial momentum thickness Reynolds number expression which consider the wall surface heating and cooling effect are constructed, the two expressions are coupled into a gamma transport model, and a transition transport model which considers the wall surface heating and cooling effect is obtained after wind tunnel example verification. Therefore, transition prediction of the stratospheric high-altitude airship under the wall surface heating and cooling effect is realized. Experiments prove that the obvious upstream movement of the transition front caused by wall surface heating can be accurately reproduced, so that a steady engineering foundation is provided for aerodynamic design and optimization of a laminar flow platform considering the non-heat-insulating wall effect in the future.

The present application relates to astaxanthin extraction technical field, specifically, it relates to astaxanthin broken wall extraction integrated equipment, including storage chamber, ultrasonic broken wall device, the first broken wall chamber and the second broken wall chamber are sequentially communicated in the lower of storage chamber, the first broken wall chamber is equipped with first broken wall subassembly, the first broken wall chamber and the second broken wall chamber are equipped with the ration discharging subassembly of communication, the second broken wall chamber bottom is equipped with the activity subassembly for controlling the intermittent discharge of ration discharging subassembly.The equipment is through setting first broken wall chamber and second broken wall chamber, realizes astaxanthin extraction when multiple broken wall, promotes broken wall effect and promotes subsequent extraction efficiency;Meanwhile, the equipment is through setting ration discharging subassembly and activity subassembly cooperation, realizes the batch broken wall of second broken wall chamber, avoids the excessive red ball of single time, reduces the broken wall effect, influences subsequent extraction quality.

This invention relates to the production of masonry-effect polymeric skin materials. In particular, the invention relates to methods for the production of masonry-effect polymeric skin materials for use, for example, in building and as architectural components for example in roofing materials such as roofing tiles, or for brick wall effect materials.

The utility model belongs to the technical field of traditional Chinese medicine refining equipment, and provides a stainless steel activated carbon elution column with a wall leakage prevention function, which comprises a column top, a column body and a column bottom, a feeding hole is fixedly embedded in the center of the top end of the column top and is fixedly connected with a spraying ball in the column top, a plurality of wall leakage prevention rings are arranged on the inner wall of the column body at intervals, and the wall leakage prevention rings are connected with the spraying ball. The column body is sleeved with a heat preservation sleeve, a liquid discharging opening is further formed in the side wall of the column body, an emptying opening is formed in the top end of the column top, the column bottom comprises a discharging bottom cover, and an eluent outlet is formed in the bottom end of the discharging bottom cover. According to the utility model, the four layers of wall leakage prevention rings are arranged in the column body, so that wall flow generated by a wall effect between the activated carbon column and the column body can flow back into the activated carbon column, the problems that the outer ring of the activated carbon column is excessively eluted and the inner ring of the activated carbon column is not eluted in place in the prior art are solved, the elution efficiency is improved, and the production cost is reduced.

The application discloses a transition prediction method considering wall heating and cooling effects, and simplifies and modifies a stability basic transport transition model, so that the application range of the stability basic transport transition model is extended to the influence of the non-adiabatic wall effect considering the generalized wall heating and cooling, the localized momentum thickness Reynolds number expression and the transition starting momentum thickness Reynolds number expression considering the wall heating and cooling effects are constructed, and the two expressions are coupled into gamma the transport model, the transition transport model considering the wall heating and cooling effects is obtained after wind tunnel example verification, and then the transition prediction of the stratosphere high-altitude airship under the wall heating and cooling effects is realized. The experiment proves that the application can accurately reproduce the significant upstream movement of the transition front caused by the wall heating, and therefore the application provides a robust engineering basis for the aerodynamic design and optimization of the future laminar platform considering the non-adiabatic wall effect.