30 results about "Diesel spray" patented technology

The invention discloses a dual-fuel engine combustion system and method based on a switchable type oil sprayer. The dual-fuel engine combustion system is characterized in that an electronic control common-rail diesel supply device, a premix natural gas supply device and the switchable type oil sprayer are connected with an electronic control system ECU, and the switchable type oil sprayer is installed on a dual-fuel engine and further connected with the electronic control common-rail diesel supply device. The dual-fuel engine combustion system and method have the advantages that the mixed gas flow, the mixed gas concentration, the diesel supply pressure and spraying timing of two spraying nozzles are controlled through an electronic control system, the sprayer covers the whole substitution rate range of the dual-fuel engine, the diesel spraying atomization quality of the dual-fuel engine is improved, and the overall performance of the dual-fuel engine is optimized.

The invention discloses an auxiliary oil-saving environmental protection device of a diesel internal combustion engine. The auxiliary oil-saving environmental protection device of the diesel internal combustion engine is communicated with a cylinder of the diesel internal combustion engine through a pipeline. Hydrogen and oxygen mixed gas is led into the cylinder and is mixed with diesel spray for combustion. The auxiliary oil-saving environmental protection device comprises a circulating gas supply device, a separating and filtering device and a circuit control system. The circulating gas supply device comprises a hydrogen an oxygen generator. A gas inlet of the separating and filtering device and a gas outlet of the hydrogen and oxygen generator are communicated through a first pipeline. A gas outlet of the separating and filtering device is communicated with a gas supply pipeline of the diesel internal combustion engine. Electrolytic gas is led in through the gas supply pipeline of the diesel internal combustion engine. The separating and filtering device is communicated with the hydrogen and oxygen generator through a second pipeline so that an electrolyte solution of the hydrogen and oxygen generator can be recycled. The circuit control system is electrically connected with the hydrogen and oxygen generator and the separating and filtering device. The auxiliary oil-saving environmental protection device can promote sufficient combustion of diesel oil in the diesel internal combustion engine, increase the combustion rate and the utilization rate of the diesel and effectively reduce the content of pollutants in exhausted tail gas, and therefore the comprehensive benefits of saving energy, reducing emission and protect the environment are achieved.

The invention belongs to the diesel spray and combustion visualization research field and discloses a measurement apparatus capable of simultaneously measuring a diesel spray structure and a combustion characteristic based on a laser diagnosis technology and a method thereof. In the past, test researches of a diesel spray characteristic and the combustion characteristic can not be performed simultaneously. In the invention, through using a Mie scattering technology of a laser and a laser induced fluorescence technology (OH-PLIF), the spray structure and the combustion characteristic during diesel combustion can be simultaneously measured and researched. The corresponding apparatus comprises a laser system, a constant volume combustion bomb system, a fuel oil supply system, a signal synchronization system and a signal acquisition system. The test apparatus can simultaneously carry out test researches of a liquid phase length of diesel spray and OH-PLIF distribution under a combustion condition, simultaneously can indicate a liquid phase area in a diesel combustion OH-PLIF distribution map and solves an interference problem of a liquid phase signal to a laser-induced fluorescence signal.

The invention discloses a diesel spray combustion simulation method based on multi-component decoupling physical and chemical substitutes, which is used for simulating the spray combustion characteristics of ‑50# diesel in alpine regions; the method includes: selecting physical substitutes for characterization‑ For the physical properties of 50# diesel, select chemical substitutes to characterize the chemical properties of 50# diesel; when carrying out diesel spray combustion simulation, when diesel is in liquid state, use the physical substitutes as diesel substitutes; when diesel evaporates from liquid Switches the diesel replacement from a physical to a chemical replacement when it becomes gaseous. The invention can better reproduce the spraying and combustion characteristics of actual diesel oil at the same time.

The invention discloses a direct injection diesel engine collision spray diffusion combustion system. A combustion chamber of the combustion system is located in the middle of the head of a piston and needs to be used in cooperation with an oil injector with a multi-hole oil nozzle. According to the structure, a boss is arranged at the bottom of the center of the combustion chamber, collision guide blocks are evenly distributed on a throat of the combustion chamber in the circumferential direction, and each guide block is provided with a collision guide bevel. In the operating process, the oil injector directly sprays oil streams onto the collision guide blocks so that the primary oil streams can be spread along the collision guide bevels without accumulating on drop points, the spray diffusion speed is high, and the space distribution range is large; besides, secondary atomization enables the sprayed particle size to become small, and distribution is more uniform under the squish effect, so that the oil and gas distribution uniformity is improved, and the goals of improving combustion and lowering oil consumption and emission are achieved.

The invention provides a constant volume bomb for a diesel spraying and burning visualization experiment. The constant volume bomb comprises a constant volume bomb body. The constant volume bomb body uses the circular-cake-shaped structure, the interior is hollow and used for forming the visualization experiment area, two sides of the circular cake are opened with visualization window holes and the end faces of the windows are pressed by sealing cover plates for sealing. The quartz glass is clamped between the body and the sealing cover plates. The upper end face is opened with a positioning hole for an oil sprayer installing base, and the unique design is suitable for use of various oil sprayers. The lower end face is opened with a positioning threaded hole for fixing the position of the constant volume bomb. The constant volume bomb body is radially opened with various installing through holes for installing various data collecting devices. The visualization spraying constant volume napalm bomb has the characteristics of simple structure, wide experiment area and transparent light path, and is capable of observing and measuring the spraying and burning processes through cooperating the schlieren method and the laser-induced fluorescence technology, remarkably improving the experiment efficiency, performing the spraying feature test to different oil sprayers and improving the adaptability of the spraying constant volume test bomb.

The invention relates to an oil-gas mixture quality optimization method of a diesel oil internal combustion engine. The oil-gas mixture quality optimization method of the diesel oil internal combustion engine comprises three optimization steps of (1) adjusting a spraying direction of diesel oil spray, and forming an included angle larger than 90 degrees between the spraying direction of the dieseloil spray and a flowing direction of an air eddy; (2) on the basis of the step (1), adjusting the number of spray holes on a diesel oil nozzle, wherein at least two spray holes are formed, and different hole diameters exist between different spray holes; the larger the hole diameter of the spray holes is, the larger a mass flow of the diesel oil spray is; and the smaller the hole diameter of thespray holes is, the smaller the mass flow of the diesel oil spray is; and (3) on the basis of the two steps, determining the mass flow and eddy strength distribution of the air eddy, colliding and mixing the air eddy with the small mass flow and low eddy strength and the diesel oil spray with the small mass flow, and colliding and mixing the air eddy with the large mass flow and high eddy strengthand the diesel oil spray with the large mass flow. According to the optimization method provided by the invention, more ideal oil-gas mixture quality can be obtained in different positions in a cylinder.

The invention provides a diesel engine electronic-control speed adjusting and testing method based on a fuzzy variable structure. An electronic-control speed adjusting system algorithm of a diesel engine is optimally designed. A nonlinear object dynamic model and an executer of the diesel engine are subjected to modeling, and a diesel spraying system of the diesel engine is controlled through thefuzzy variable structure; then discontinuous control conditions are deduced through the Lyapunov function, and it is proved that a system has the capacity of stability adaptive adjusting under uncertain interference; and finally, the diesel engine speed-adjusting system is subjected to a Matlab / Simulink simulation experiment. Control over accuracy of the rotating speed of the diesel engine by thediesel engine electronic-control speed adjusting system can be improved to a great extent under the uncertain interference, and the good effect under various uncertain interference backgrounds such asstarting, idling, working condition sudden increasing and reducing is achieved so that the method can meet the situation that the good control effect is achieved on the diesel engine in the practicalworking process.

The invention discloses a method for automatically identifying the diesel spray breaking process and automatically realizing spray continuous calculation, thereby automatically judging the process of liquid film breaking to liquid droplets in the diesel spray process, and realizing the SD-ELSA algorithm for spray continuous calculation. The SD-ELSA algorithm is based on the calculation of the sphericity and average particle diameter of the liquid phase in the grid, uses the Lagrangian method to calculate the particles in the flow field, and uses the Euler model to calculate the grid node information in the full flow field. For the grid of continuous liquid phase, the Euler clumps that meet the two criteria are converted into particles and recalculated by Lagrangian method. This method realizes the dynamic conversion coupling of the Euler-Lagrangian model, can automatically obtain the complete information of the discrete phase and the continuous phase of the flow field and perform iterative calculations, and obtain the liquid column, primary crushing and secondary crushing of the diesel jet flow. stage, fully expressing the process of diesel spraying.