EXRERIMENTAL STUDY OF THE PULSED WATER-GAS JET

A new pulsed jet device is presented which can produce oscillatory pulsed wafergas jet. This device is used in the erasive experiment on the while sandbrick whose compressive resistance is 30 Mpa. The curves of the erasive effects of the oscillatory pulsed water-gas jet.the oscillatory pulsed jet and the ordinary jet are drawn in order to be compared.which are changed as the distances of the targets are changed. In addition the reason why the erasive effect of the new jet is superior to the other two jets is analyzed.     

THE EROSION STUDY OF THE SELF-EXCITED OSCILLATION CAVITATION JET

Based on references [1, 2, 3], we designed a set of device of the self-excited oscillation cavitating jet. Its cavitation mechanism and the result of jet impact block are analysed. With erosive volume as the object, the effect of the self-excited oscillation cavitating jet is compared with that of conventional continuous jet under the same condition. It is found cxperimeetally that the position of suction air and the air quantities and the geometrical parameters of the device have great effect on the erosive effects of the self-excited oscillation cavitating jet. In certain range of stand off distance, it's not obvious that the erosive effects of the self-excited oscillation cavitating jet changed with stand off distance for pulse cavitating jet and cavitation bubblies and droplet impinging on the target. Compared with continuous jet, the erosive vo-l ume and area of the self-excited oscillation cavitating jet is more than one time larger than the continuous jet.     

A STUDY ON THE PROPERTY AND REACTION MECHANISM OF MULTICOMPONENT MICELL COMPLEX WITH FLUORESCENT SPECTROMETRY

In this paper, a new method of studying multicomponent micell complex with fluoresence spectrometry and ion exchange is presented. This method is simple, clear and rapid. The reaction-mechanism of micellar complex is presented. The micellar electric sign is studied. The decomposing state of flourent reagent in the solution is described.     

A STUDY OF THE OPTIMIZATION OF CIRCULAR ARC TOOTH PROFILE TRANSMISSION

For the first time, we point out the new idea that we can approximate the involute tooth profile transmission to circular arc tooth profile transmission. Looking upon it as a fourbar linkage we try to minimax the error of the velocity ratio and evaluate the strong-weak point of circular arc tooth profile transmission.     

A STUDY OF THERMOTECHNICAL CHARACTERISTICS IN FORCED CONVECTION BATCH FURNACE

An experimental study of heat transfer mechanism and characteristics of high velocity circulation combustion gas in a batch heat treatment furnace with high velocity burner was presented. The regular patterns of variation of total heat flux, heat convection and radiation heat fluxes given heating materials with heating time were obtained. It was revealed from the results of experiment and calculation that inverse heat flux of metal radiation is an unavoidable heat transfer characteristic.     

THE STUDY FOR LARGE INCLUSIONS OF STAINLESS STEEL (1Crl8Ni9Ti) DURING CONTINUOUS CASTING

This paper presents the process of stainless steel ( 1Crl8Ni9Ti) in continuous casting,the components and their shapes,origins and distributions of the large inclusions existing in the steel,as well as the influence on its quality. By the observation through a microscope,the structural analysis adopting x-ray examinating instrument and the measunement for the microzone of billet employing the electronic probe.it has been found that the large inclusions of continuous billet mainly originate from the slag-sweeping of the tundisy and mold. There are mostly spherical-slag in addition to Ti(C.N) in the inclusions. The calculations in theory point out that the siO2in the slag can' t change Ti(C,N) into TiO2,however,it can assimilate with Ti(C.N). The large inclusions affect the quality of the steel plate and tube greatly. As a result,this paper proposes the measures of reducing the large inclusions in the steel.     

A STUDY OF THE DUPLEX YIELD CHARACTER OF DUAL PHASE STEEL

In this paper, the duplex yield character (DYC) of dualphase steel has been discussed. The results of the tests show that the DYC is due to the martensite deformation from the elastic state to the plastic state and the microvoid formed from the interphase boundaries. The DYC is directly affected by the phase ratio and the shape of structure. According to the different deformation character of the duplex phase, the uniform deformation of dual phase steel divide into three stages.     

ON THE STUDY OF THE INFLUENCE OF MASS DISTRIBUTION ON DYNAMIC CHARACTERISTICS OF A SPINDLE SYSTEM WITH MODALITY ANALYSIS METHOD

The modality analysis method is employed in this paper to study the influence of mass distribution on dynamic characteristics of a spindle system. It is found that there exist obvious difference between the influences of different mass distribution on the natural frequencies . and modality flexbilities of various order-mode. It is shown that the proportion of modality flexbility in the astatic flexbility can be equilibrated by means of adjusting correctly the mass distribution of the spindle system so that the cutting stability is improved as well. Experiment results are quoted to confirm, in a certain degree, the conclusion above.     

STUDY ON YINCHUAN, A FAMOUS CITY WITH BEAUTIFUL SCENERY AND CHARACTERISTICS IN THE NORTH OF THE GREAT WALL

This paper presents the style and features of Yinchuan with a long history and culture,and analyses the relations between protection of the city and the modernization of the city.