Traditionally,shock temperature determination of metals needs to do a two-step calculation from the measured thermal radiation history.In this paper,however,we present some experimental events which make it possible t...Traditionally,shock temperature determination of metals needs to do a two-step calculation from the measured thermal radiation history.In this paper,however,we present some experimental events which make it possible to deduce the release temperature directly from the measured interface radiation history record.展开更多
Hugoniot curves and shock temperatures of gas helium with initial temperature 293 K and three initial pressures 0.6,1.2,and 5.0 MPa were measured up to 15000 K using a two-stage light-gas gun and transient radiation p...Hugoniot curves and shock temperatures of gas helium with initial temperature 293 K and three initial pressures 0.6,1.2,and 5.0 MPa were measured up to 15000 K using a two-stage light-gas gun and transient radiation pyrometer.It was found that the calculated Hugoniot EOS of gas helium at the same initial pressure using Saha equation with Debye-Hückel correction was in good agreement with the experimental data.The curve of the calculated shock wave velocity with the particle velocity of gas helium which is shocked from the initial pressure 5 MPa and temperature 293 K,i.e.,the D^u relation,D=C_(0)+λu(u<10 km/s,λ=1.32)in a low pressure region,is approximately parallel with the fitted D^u(λ=1.36)of liquid helium from the experimental data of Nellis et al.Our calculations show that the Hugoniot parameterλis independent of the initial densityρ_(0).The D^u curves of gas helium will transfer to another one and approach a limiting value of compression when their temperature elevates to about 18000 K and the ionization degree of the shocked gas helium reaches 10^(-3).展开更多
The shock temperatures of water under 35-50 GPa are firstly measured by the optical pyrometry technique. Cν is a constant below 51 GPa (Cν=7.07R), and increases with the temperature above 51 GPa (Cν=(5.76+3.84×...The shock temperatures of water under 35-50 GPa are firstly measured by the optical pyrometry technique. Cν is a constant below 51 GPa (Cν=7.07R), and increases with the temperature above 51 GPa (Cν=(5.76+3.84×10-4T)R). From our calculation, the dissociation has little effect on Cν. But the electron is essential to the Cν calculation.展开更多
基金Supported by and performed at the Laboratory for Shock Wave and Detonation Physics Research,Southwest Institute of Fluid Physics.
文摘Traditionally,shock temperature determination of metals needs to do a two-step calculation from the measured thermal radiation history.In this paper,however,we present some experimental events which make it possible to deduce the release temperature directly from the measured interface radiation history record.
文摘Hugoniot curves and shock temperatures of gas helium with initial temperature 293 K and three initial pressures 0.6,1.2,and 5.0 MPa were measured up to 15000 K using a two-stage light-gas gun and transient radiation pyrometer.It was found that the calculated Hugoniot EOS of gas helium at the same initial pressure using Saha equation with Debye-Hückel correction was in good agreement with the experimental data.The curve of the calculated shock wave velocity with the particle velocity of gas helium which is shocked from the initial pressure 5 MPa and temperature 293 K,i.e.,the D^u relation,D=C_(0)+λu(u<10 km/s,λ=1.32)in a low pressure region,is approximately parallel with the fitted D^u(λ=1.36)of liquid helium from the experimental data of Nellis et al.Our calculations show that the Hugoniot parameterλis independent of the initial densityρ_(0).The D^u curves of gas helium will transfer to another one and approach a limiting value of compression when their temperature elevates to about 18000 K and the ionization degree of the shocked gas helium reaches 10^(-3).
基金supported by the Auspices of the Science Foundation (Grant No. 10874141)
文摘The shock temperatures of water under 35-50 GPa are firstly measured by the optical pyrometry technique. Cν is a constant below 51 GPa (Cν=7.07R), and increases with the temperature above 51 GPa (Cν=(5.76+3.84×10-4T)R). From our calculation, the dissociation has little effect on Cν. But the electron is essential to the Cν calculation.
