In this paper, the geometric size of the oscillating chamber of self-exciting oscillation pulse nozzle is optimized. It is found that the influence of the length of interior chamber on oscillation effect is greater than its diameter.
The relationship between abrasive concentration, length of oscillating chamber, standoff distance and cutting depth, erosion rate as well as cutting specific energy was investigated by experiments in the submerge and surface conditions. The cutting and erosion capabilities of the pre-mixed abrasive water jet and the pulsed abrasive water jet were analyzed in contrast.
The dynamic characteristics of pulsed water jets and the relationship between length of oscillating chamber,standoff distance ,abrasive concentration and erosion rate as well as cutting specific energy for the pulsed abrasive water jet were investigated by experiments under submerged and in the air. The cutting and erosion capabilities of the pre-mixed abrasive water jet and the pulsed abrasive water jet on granite and limestone were analyzed comparatively.
By the study of the theory about flow characteristic in the cavity, the mathematical model applied in the flow field of the self-excited oscillation and external-excited oscillation cavity was established, then the numerical simulation about three-dimensional flow field is carried on through the fluid dynamics software of ANSYS.
In the light of wave theory principle, the mathmatical model of fluid pressure and velocity in the cavity of autoexcitation jet flow is set up and the jet flow experimental research is done by approximating the actural diameter of the nozzel and enlarging the size of nozzel box to widen the oscillation cavity.
The numerical results, coinciding with the tests, clearly show that the device has functions of oscillator and lowpass filter, its natural frequency, which is significantly influenced by the length of oscillation cavity and pressure, is determined by the structure of the nozzle and wave speed.
A common waveguide cavity is designed for both the fundamental and 2nd harmonic frequency, Mechanical tuning range is up to 15GHz(100-115GHz), output power is over 5mW and maximum output power is 18.5mW. The linear electronic tuning range is more than 250MHz.
The stable output energy of 19mJ,which has perfect beam quality,was obtained at repetition rate 5Hz when pump energy is 17J,because of the design of the novel SBS oscillator.
A discussion of influence on the efficiency of PTM mode operation has been given. As compared to the normal operation, the peak power output has been increased by 22 times with an output pulse-width of 5~25 ns.
AbstractThe configuration of a semimonolithic continuous nondegenerate optical parameter oscillator consisting of an αcut KTP crystal pumped by an intracavity frequencydoubled and frequencystabilized Nd∶YAP laser is designed. Both twomode quadraturephase squeezing of 3 7dB and intensitydifference squeezing of 7dB have been generated from the cwNOPO operating respectively below and above the oscillation threshold.
With an incident pump power of 4.5 W, a maximum of 1.48 W Raman output power at a repetition rate of 30 Hz was obtained, corresponding to an overall optical-to-optical conversion efficiency of 32.9%. The slope efficiency was calculated as 40%.
This paper describes the theoretical analysis and experimental investigation of PTM mode operation of the flash-lamp pumped R-6G dye laser. A discussion of influence on the efficiency of PTM mode operation has been given. As compared to the normal operation, the peak power output has been increased by 22 times with an output pulse-width of 5~25 ns.
It is presented in this paper that square wave modulation for Gunn oscillator can be achieved using a varactor and cavity or cavities.The varactor is placed on the side wall of the Gunn oscillator,Because the frequency and amplitude of the output signal of the Gunn oscillator vary with bias voltage of the varactor, it is modulted when a square wave is applied to the varactor.The signal frequency corresponding to the bottom of the square wave is different from that corresponding to the top.When the signal co...
It is presented in this paper that square wave modulation for Gunn oscillator can be achieved using a varactor and cavity or cavities.The varactor is placed on the side wall of the Gunn oscillator,Because the frequency and amplitude of the output signal of the Gunn oscillator vary with bias voltage of the varactor, it is modulted when a square wave is applied to the varactor,The signal frequency corresponding to the bottom of the square wave is different from that corresponding to the top. when the signal c...