11 results about "Collision frequency" patented technology

This invention provides a method for diagnosing parameters of non-uniform plasmas based on the local microwave penetration effect. This method relates to the fields of electromagnetics and plasma diagnostics, and includes a combined diagnosis of the electron density distribution and collision frequency of a plasma profile. The method models the plasma to the left of the peak layer by layer and iteratively optimizes the distribution results. The method also uses the maximum reflection coefficient amplitude slope to derive the plasma electron density peak. For the plasma to the right of the peak, the method models multiple distribution models, determining the model using the attenuation coefficient. Furthermore, the method uses the maximum reflection coefficient amplitude to diagnose the collision frequency. This method addresses the problem of diagnosing parameters of non-uniform plasma profiles.

The invention discloses a plasma parameter diagnosis method, system and equipment based on transmission signal wave impedance characteristics and a medium. The method comprises the steps of calculating a reciprocal of a plasma equivalent relative dielectric constant and separating a real part and an imaginary part by collecting attenuation and phase shift generated by a uniform plasma, determining the position of a transmission signal wave impedance invariant point, and determining the impedance invariant point of the transmission signal wave by combining the real part and the imaginary part of the reciprocal of the equivalent relative dielectric constant and the positive and negative properties of a first derivative thereof. Correctness verification and screening are carried out on transmission signal wave impedance invariant points, the electron density and the collision frequency of the uniform plasma are diagnosed, and the result has high accuracy and reliability. The system, the equipment and the medium are used for realizing the method. On the premise that the diagnosis precision is not lost, the working frequency of the adopted incident electromagnetic waves is greatly smaller than that of a traditional microwave transmission method, the frequency band data can be fully utilized, and the cost of diagnosis equipment is saved.

This invention discloses a multi-domain coupled uniform flow high-efficiency electrostatic precipitator, relating to the technical field of electrostatic precipitator equipment. It includes a precipitator housing with inlets and outlets on both sides. The interior of the precipitator housing is sequentially divided along the gas flow direction into multiple conventional electric field adsorption zones and at least one low-velocity electric field adsorption zone. The low-velocity electric field adsorption zone includes multiple anode units, multiple flow guiding components, and multiple cathode units. This invention utilizes the flow guiding components, the corrugated anode plate, and through holes on the first and second sidewalls. The flow guiding components divert the flue gas, allowing some gas to directly impact the V-shaped groove. Compared to conventionally designed through holes, the staggered arrangement of the through holes disrupts the stable airflow path, causing more intense collisions, shearing, and turbulence in the airflow entering the V-shaped groove from different directions. This significantly increases the collision frequency and energy between particles, resulting in larger and more easily captured particles.

The invention discloses a dynamic electromagnetic reverberation chamber based on plasma regulation and control and a control method thereof, and belongs to the technical field of electromagnetic testing. A plasma array module and a driving control module are arranged on the inner wall surface of a cavity of the reverberation chamber; the electronic density and the collision frequency of the plasma unit are changed by adjusting the discharge parameters of the plasma unit in real time, so that the equivalent quality factor Q value, the normalized field intensity and the energy attenuation time constant of the reverberation chamber are dynamically and continuously adjusted and controlled; the limitation that a traditional reverberation chamber depends on a fixed wave-absorbing material or a mechanical stirrer is broken through, millisecond-level rapid switching of key electromagnetic parameters is achieved, the device has the advantages of being high in space efficiency, compatible in broadband and flexible in working mode, and the testing efficiency and the application range of the reverberation chamber are remarkably improved.

The invention provides an arc wind tunnel dynamic flow field plasma parameter microwave measurement device and method, the device comprises an arc wind tunnel, a microwave system, a vector analyzer and a data processing module, a transmitting antenna and a receiving antenna of the microwave system are coaxially and horizontally arranged on two sides of a plasma flow field, and a beam waist is accurately aligned with the center of the flow field. According to the method, static and dynamic S parameters are measured through system self-calibration and wide-frequency-band frequency sweeping, a net transmission coefficient is calculated, and the electron density and the collision frequency are synchronously obtained by combining a forward calculation model, a residual objective function, a genetic algorithm and a Levenberg-Marquardt combined inversion algorithm. According to the invention, non-contact measurement is adopted, and a time domain gating filtering technology is matched, so that the problems of clutter interference and equipment ablation are avoided, online real-time accurate measurement of plasma parameters is realized, and reliable data support is provided for research on related characteristics of aircrafts.

The present application belongs to the field of signal and information processing, and specifically relates to a method for extracting the collision frequency of the ionospheric F region based on incoherent scattering radar, aiming to solve the problem of being unable to obtain the 24-hour change of the collision frequency of the ionospheric F region. The method includes: obtaining ionospheric parameters of the ionospheric F region based on incoherent scattering radar; obtaining ion vector velocity based on the ion line-of-sight velocity under multiple line-of-sight directions; determining the zero-value altitude of the diffusion velocity based on the electron density, electron temperature, ion temperature and ion mass when the diffusion velocity of ions in the ionosphere is 0; determining the target diffusion velocity at the target altitude based on the meridional wind, ion vector velocity and magnetic inclination at the zero-value altitude of the diffusion velocity; and determining the collision frequency of the ionospheric F region based on the target diffusion velocity. The present application realizes 24-hour continuous measurement of the collision frequency of the ionospheric F region.

The invention belongs to the field of oil and gas field development, and particularly relates to a method for determining the critical reflux flow of a deep coal bed gas fracturing propping agent. A method for determining the critical reflux flow of deep coal bed gas fracturing propping agents is characterized in that in the fracturing flow-back process, on one hand, the propping agents have the reflux phenomenon, the propping agents collide with one another to generate momentum exchange, and the propping agents are subjected to dragging force generated by coal bed gas on the propping agents; proppant driving force is obtained according to the collision momentum exchange force, the collision frequency and the dragging force of the collision; on the other hand, in the migration process of the proppant, the proppant is also subjected to gravity horizontal component force and friction force; a proppant critical reflux velocity calculation model is established through balance conditions of proppant driving force, gravity horizontal component force and friction force in a critical state, and then the proppant critical reflux velocity calculation model is converted into a proppant critical reflux flow calculation model to calculate the proppant critical reflux flow. Reliable technical support can be provided for coal bed gas development.

The invention relates to the field of coal-fired flue gas treatment, and discloses a method for removing SO3 in coal-fired flue gas through charge coagulation, which comprises the following steps: S1, a pre-charging step: enabling SO3 aerosol to carry first polar charges; s2, a generation and injection step: atomizing the alkaline solution into alkaline microdroplets carrying second polar charges; s3, coagulation: driving the two kinds of particles to move relatively by utilizing the traveling wave electric field; s4, acquiring a real-time feedback signal reflecting the coagulation efficiency; and S5, dynamically adjusting the operation parameters based on the feedback signal. According to the invention, electric field forces with opposite directions are applied to SO3 aerosol and alkaline microdroplets carrying charges with opposite polarities through a traveling wave electric field to drive the two kinds of particles to generate relative motion, and the particle coagulation is converted from a passive process depending on slow Brown diffusion into a capture process dominated by an external electric field, so that the particle coagulation efficiency is improved. Furthermore, the collision frequency and the coagulation rate among the submicron particles are improved.

This invention proposes a variable scaling method for PIC-MCC models, comprising: establishing an initial PIC-MCC physical model; selecting a scaling factor and, following the discharge similarity law, constructing variable scaling relationships between plasma density, collision cross section, and particle kinetic energy in a scaled-down PIC-MCC simulation model corresponding to the PIC-MCC physical model; determining variable scaling relationships between thermocurrent density, plasma frequency, particle collision frequency, and particle collision probability in the scaled-down PIC-MCC simulation model; determining the variable scaling relationship parameters in the scaled-down PIC-MCC simulation model, conducting plasma particle simulation, and mapping the calculation results of the scaled-down PIC-MCC simulation model back to the initial PIC-MCC physical model. This invention solves the problems of existing scaling techniques exacerbating plasma instability and local electric field effects, and maintains undistorted simulation results even at large scaling ratios, significantly improving calculation accuracy.

The application relates to the field of coal-fired flue gas treatment, and discloses a method for removing SO3 in coal-fired flue gas through charging and coagulation, which comprises the following steps: step S1, a pre-charging step: making the SO3 aerosol carry a first polarity charge; step S2, a generating and injecting step: atomizing an alkaline solution into alkaline droplets carrying a second polarity charge; step S3, a coagulation step: using the traveling wave electric field to drive the relative movement of the two kinds of particles; step S4, obtaining a real-time feedback signal reflecting the coagulation efficiency; and step S5, dynamically adjusting the operation parameters based on the feedback signal. Through the traveling wave electric field, the SO3 aerosol carrying opposite polarity charges and the alkaline droplets are subjected to electric field forces in opposite directions, the relative movement between the two kinds of particles is driven, the particle coagulation is changed from a passive process depending on slow Brownian diffusion into a capture process dominated by an external electric field, and then the collision frequency and coagulation rate between submicron particles are improved.

A kind of ionospheric absorption effect evaluation method based on multi-source measured data driving, comprising the following steps: step 1, obtaining and preprocessing of altimeter observation data, obtaining optimal sunspot number using altimeter data;Step 2, calculating the electron density on the link using three-dimensional time-varying ionospheric empirical model;Step 3, obtaining and preprocessing of GRACE satellite observation data, obtaining optimal solar radio flux and geomagnetic index using GRACE satellite data;Step 4, reconstructing atmospheric density and temperature at different altitudes on the link using global atmospheric empirical model;Step 5, calculating electron and ion, neutral particle collision frequency;Step 6, calculating ionospheric absorption attenuation.The method disclosed in the application optimizes empirical model using data driving to reconstruct electron density, atmospheric composition temperature and density on the communication link, and finally realizes modeling of ionospheric absorption effect on the communication link, which can provide model support for communication effect evaluation of ultra-short wave and above frequency band radio information system.