Overview of Flow Diagnosis in a Shock Tunnel

Kim, Ikhyun; Lee, Sung-Min; Park, Gisu; Lee, Jong Kook

doi:10.5139/ijass.2017.18.3.425

Cited by 20 publications

(12 citation statements)

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“…In addition, the trans-rotational temperature T tr and electronelectronic-vibrational temperature T eev in present calculation were similar to the calculation results of Park [32]. [18,19], installed at KAIST. The K1 shock-tunnel consists of four parts, the shock-tube, Mach 6 nozzle, test section, and dump tank.…”

Section: Plos Onesupporting

confidence: 85%

“…In addition to the 3-T model, previous 1-T and 2-T models were adopted in the Q1D flow calculations to compare the results, and to investigate the thermochemical nonequilibrium flows. For Cases A, B, and C, the calculated results for the shock-tube and shock-tunnel operation modes were compared with existing experimental data [18,20,21]. The shock-tunnel flow calculation was additionally performed for Case D, to numerically investigate the thermochemical nonequilibrium flows in the maximum available dry air gas operating condition.…”

Section: Thermochemical Nonequilibrium Analysismentioning

confidence: 99%

“…When comparing the NO species which is mainly produced by N 2 and O collisions, the amount of NO in the 3-T model was lower than in the 1-T and 2-T models, because the amount of dissociated O was relatively small in the 3-T model. Fig 8 shows the calculated results of the shock-tunnel flows for the flow conditions in Case C. The experiments in the shock-tunnel mode were conducted by Kim et al [18]. In Fig 8(a), the calculated pressure is compared with the experimental data which was measured at Channel 3.…”

Section: Plos Onementioning

confidence: 99%

“…In the species vibrational energy, the vibrational energies of O 2 , NO, and O 2 + are grouped and treated as another nonequilibrium energy mode. In the present study, a thermochemical nonequilibrium flow analysis of the K1 shock-tunnel facility [18,19] was conducted using the proposed 3-T model. In the shock-tunnel flow calculation, the Q1D method was employed by dividing the flow calculations into two parts, the shock-tube and the Mach 6 nozzle.…”

Section: Introductionmentioning

confidence: 99%

“…In the shock-tunnel flow calculation, the Q1D method was employed by dividing the flow calculations into two parts, the shock-tube and the Mach 6 nozzle. The results for the shock-tunnel flows calculated using the 3-T model were compared with existing experimental data [18,20,21] and the calculated results obtained from previous 1-T and 2-T models for various operating conditions in the K1 shock-tunnel facility.…”

Section: Introductionmentioning

confidence: 99%

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Thermochemical nonequilibrium flow analysis in low enthalpy shock-tunnel facility

et al. 2020

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A thermochemical nonequilibrium analysis was performed under the low enthalpy shocktunnel flows. A quasi-one-dimensional flow calculation was employed by dividing the flow calculations into two parts, for the shock-tube and the Mach 6 nozzle. To describe the thermochemical nonequilibrium of the low enthalpy shock-tunnel flows, a three-temperature model is proposed. The three-temperature model treats the vibrational nonequilibrium of O 2 and NO separately from the single nonequilibrium energy mode of the previous two-temperature model. In the three-temperature model, electron-electronic energies and vibrational energy of N 2 are grouped as one energy mode, and vibrational energies of O 2 , O 2 + , and NO are grouped as another energy mode. The results for the shock-tunnel flows calculated using the three-temperature model were then compared with existing experimental data and the results obtained from one-and two-temperature models, for various operating conditions of the K1 shock-tunnel facility. The results of the thermochemical nonequilibrium analysis of the low enthalpy shock-tunnel flows suggest that the nonequilibrium characteristics of N 2 and O 2 need to be treated separately. The vibrational relaxation of O 2 is much faster than that of N 2 in low enthalpy condition, and the dissociation rate of O 2 is manly influenced by the species vibrational temperature of O 2. The proposed three-temperature model is able to describe the thermochemical nonequilibrium characteristics of N 2 and O 2 behind the incident and reflected shock waves, and the rapid vibrational freezing of N 2 in nozzle expanding flows.

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Section: Plos Onesupporting

confidence: 85%

Section: Thermochemical Nonequilibrium Analysismentioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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