Numerical study of shock wave interaction in steady flows of a viscous heat-conducting gas with a low ratio of specific heats

Shoev, Georgy; Иванов, М. С.

doi:10.1134/s0869864316030045

Cited by 13 publications

(12 citation statements)

References 18 publications

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“…The deflection angle profiles show smooth variation between the equilibrium and frozen solutions. The profile y 3 shows a negative deflection angle, which was also observed in [46] for a frozen flow with a low ratio of specific heats.…”

Section: -3mentioning

confidence: 79%

Numerical study of thermochemical effects on the flowfield structure near the triple point at irregular reflection of shock waves

Shoev

Petrov

Vashchenkov

et al. 2017

AIP Conference Proceedings

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Section: -3mentioning

confidence: 79%

Numerical study of thermochemical effects on the flowfield structure near the triple point at irregular reflection of shock waves

Shoev

Petrov

Vashchenkov

et al. 2017

AIP Conference Proceedings

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“…Equation (2) indicates that the internal pressure change Δ P of the pressurized sensor is the sum of the pressure P A before being pressurized and the pulse wave pressure P a . Therefore, the proportional relationship between the pressure changes of P A and Δ P is determined in Equation (3), which involves the ratio of specific heats γ, which is about 1.4 for air [ 17 ]. The mass m is then SL times the density of air ρ, as per Equation (4), moved by the difference in pressure between the artery and piezoelectric ceramic.…”

Section: Materials and Designsmentioning

confidence: 99%

Piezoelectric Sensor for the Monitoring of Arterial Pulse Wave: Detection of Arrhythmia Occurring in PAC/PVC Patients

Guo

Wang²,

Hsieh

2021

Sensors

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Previous studies have found that the non-invasive blood pressure measurement method based on the oscillometric method is inaccurate when an arrhythmia occurs. Therefore, we propose a high-sensitivity pulse sensor that can measure the hemodynamic characteristics of the pulse wave and then estimate the blood pressure. When an arrhythmia occurs, the hemodynamics of the pulse wave are abnormal and change the morphology of the pulse wave. Our proposed sensor can measure the occurrence of ectopic beats from the radial artery, and the detection algorithm can reduce the error of blood pressure estimation caused by the distortion of ectopic beats that occurs when the pulse wave is measured. In this study, we tested patients with premature atrial contraction (PAC) or premature ventricular contraction (PVC) and analyzed the morphology of the pulse waves when the sensor detected the ectopic beats. We discuss the advantages of using the Moens–Korteweg equation to estimate the blood pressure of patients with arrhythmia, which is different from the oscillometric method. Our research provides a possible arrhythmia detection method for wearable devices and can accurately estimate blood pressure in a non-invasive way during an arrhythmia.

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“…Although, many theoretical, experimental and computational studies have been published for past years [25][26][27][28][29][30][31], research of different types of refraction is far from complete. In this study, domains of existence of various shock-wave structures with reflected disturbances of two types and boundaries between them are defined.…”

Section: Introductionmentioning

confidence: 99%

Refraction of Oblique Shock Wave on a Tangential Discontinuity

Булат¹,

Melnikova²,

Волков³

et al. 2021

Preprint

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Refraction of an oblique shock wave on a tangential discontinuity dividing two gas flows with different properties is considered. It is shown that its partial reflection occurs excepting of geometrical diffraction of an oblique shock. Another oblique shock, expansion wave or weak discontinuity that coincides with Mach line, can act as a reflected disturbance. This study focuses on relationships which define the type of reflected discontinuity and its parameters. Domains of existence of various shock-wave structures with reflected disturbances of two types and boundaries between them are defined. The domains of parameters with one or two solutions exist for the characteristic refraction. Conditions of the regular refraction and the Mach refraction are formulated, and boundaries between those two refraction types are defined for various types of gases. Refraction phenomena in various engineering problems (hydrocarbon gaseous fuel and its combustion products, diatomic gas, fuel mixture of oxygen and hydrogen etc.) are discussed.

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Numerical study of shock wave interaction in steady flows of a viscous heat-conducting gas with a low ratio of specific heats

Cited by 13 publications

References 18 publications

Numerical study of thermochemical effects on the flowfield structure near the triple point at irregular reflection of shock waves

Numerical study of thermochemical effects on the flowfield structure near the triple point at irregular reflection of shock waves

Piezoelectric Sensor for the Monitoring of Arterial Pulse Wave: Detection of Arrhythmia Occurring in PAC/PVC Patients

Refraction of Oblique Shock Wave on a Tangential Discontinuity

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