The study of combustion in the plateau environment has gradually aroused interest scholars. Due to particularity environment, these experiments are usually carried out artificial low-pressure chambers. image processing continuous flames recently been widely used scientific research and detection applications for various thermal power devices. In this paper, three methods selecting optimal threshold flame binarization images were investigated by using a video horizontal diesel spray chamber....

The burning state of a plateau environment is attracting more and attention. In this paper, in order to have deeper scientific understanding diesel spray combustion the characteristics flame under different cone angles environment, experiments were carried out low pressure chamber. morphology was recorded by high speed video instrument, temperature change thermal imager thermocouples. MATLAB programming used process image flame, probability its binarization calculated. results indicate that...

It is a difficult scientific problem of applied fluid mechanics that the flame too long and does not match furnace chamber in small restricted heating space. This paper aims to investigate effect air quantity distribution ratio on height flue gas self-circulation burner. In order obtain better combustion emission shorter height, burner head structure with was designed. Numerical simulation employed different distributions central air, swirling secondary height. The periodic boundary...

At present, the burning problem of low power burners widely used in emergency and stove heating on plateau has gradually attracted people’s attention. The fuel injection pressure, inlet air flow, distribution regulation coefficient, environmental pressure were considered respectively, then four factors six levels a uniform experimental investigation conducted low‐pressure chamber with adjustable atmospheric pressure. flame morphology, temperature, NO emission investigated, their correlation...

The problems of long flame and high pollution emissions in low power burners are wide concern small heating devices. To solve this problem, a diesel burner with self-circulation flue gas was designed herein. In order to obtain deeper scientific understanding the emission characteristics different spray cone angles, numerical calculation method used investigate them. Reasonable flow, heat transfer, combustion models were selected, periodic boundary conditions verify feasibility model. results...

In order to more accurately predict the coupled in-line and cross-flow vortex-induced vibration (VIV) response of deep-water marine drilling risers in linearly sheared flows, an improved three-dimensional time-domain model based on van der Pol wake oscillator models was established this paper. The impact changing added mass coefficients taken into account model. finite element, Newmark- β , Newton–Raphson methods were adopted solve nonlinear partial differential equations. entire numerical...

To solve the low energy utilization and high pollutant emission caused by incompatibility between combustion flame shape heating surface structure of stove chamber, concept adaptability was proposed based on theory synergetics. A evaluation model established to quantitatively evaluate flames an integrated Chinese cooking stove. Six suitability indexes were determined, including temperature uniformity, reflux area, emission, flow resistance, heat transfer intensity, power consumption. And...

Abstract It is widely accepted that vortex-induced vibration (VIV) a major concern in the design of deep sea top-tensioned risers, especially when riser subjected to axial parametric excitations. An improved time domain prediction model was proposed this paper. The based on classical van der Pol wake oscillator models, and impacts in-line vessel heave motion were considered. finite element, Newmark-β Newton‒Raphson methods adopted solve coupled nonlinear partial differential equations....

In order to analyse the natural vibration frequencies and mode shapes of deep sea top tensioned riser, an analysis model is established in present study. The effect in-line bending displacement on riser considered model. finite element method adopted this paper calculate riser. top-tension force current velocity has discussed Results show that frequency direction higher than cross-flow are not standard sinusoidal curve. different from direction. Moreover, change surface a great influence shapes.

In this paper, considering combined excitations of the steady current, surface wave, internal solitary wave as well as, vessel’s surge and heave motions, a time‐domain model is established to investigate lateral dynamic response marine drilling risers. The finite element Newmark‐ β methods are used solve nonlinear partial differential equation in time‐domain. entire numerical solution process realized by self‐developed program based on MATLAB. reliability verified comparing it with published...

Virtual human body model is important of the products for ergonomics optimization design. In this paper, a virtual was built using SolidWorks software. The function "configuration manager" in makes serial rebuilding models easy without reimporting with different dimensions many times. Therefore, it becomes efficient and convenient optimization.

On the plateau, atmospheric pressure is reduced, which effects diesel combustion feature prominently. Combustion process of oil droplet under different environment were calculated by theoretical programming and numerical simulation method. Considering drag air flow relative motion, burning time motion path single have been conducted calculation. Burning regulation initial particle size received, including time, Droplet drag. The relationships between or are found respectively. Combining with...

Low NOX combustion technology is taken more and seriously. A new type of flue gas self-circulation low-NOx structure was preliminary designed in this paper. The 3D model established. Using the probability density function (PDF), a comparison data with result experimental can verify feasibility selected calculation model. In addition, numerical simulation small-sized diesel burner' process investigated. results show that: At exit burner head, radial velocity distribution presented "W"...

Based on the adaptability theory of synergetics, concept flame is proposed to quantitatively evaluate flames and an integrated Chinese cooking stove. Six suitability evaluation indexes stoves were determined, including temperature uniformity, reflux area, pollutant emission, flow resistance, heat transfer intensity, power consumption. A system was established. And t he stove under different working conditions calculated analyzed. It found that highest, with a value 0.841, when φ = 1.06, α...