Aerodynamic Interference during Sabot Discard

Schmidt, Edward M.; Shear, D. D.

doi:10.2514/3.57301

Cited by 31 publications

(9 citation statements)

References 2 publications

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“…When the APFSDS is ejected from the gun tube, the separation of sabots from the rod is called as the sabot discarding process (SDP), and it is accompanied by mechanical and aerodynamic interference [5]. In particular, the sabot spin rate and tangential velocity of the APFSDS affect the aerodynamic interference of the SDP, which results in the loss of stability and a sacrifice of accuracy [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…A series of shocks, including attached waves, detached shock waves, choked flows, reflected waves, and expansion waves, as shown in Figure 2(b), accompany the SDP. erefore, this separation is a complex process that involves various shock wave interactions [6].…”

Section: Introductionmentioning

confidence: 99%

“…Scholars have analyzed several sticking points of the SDP at different periods. In the 1980s, Schmidt and Shear [6,7] conducted several important and fundamental investigations in shooting tests and measurement. Consequently, Schmidt and Shear [6] showed that aerodynamic interference affected the rod characteristics, and Schmidt [7] revealed the effects of multiple shock and boundary layer interactions.…”

Section: Introductionmentioning

confidence: 99%

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Sabot Discard Characteristics under Different Spin Rates of the Rifled Barrel Launching APFSDS

Zhang

Wang

Liu

et al. 2021

Shock and Vibration

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The sabot discard asymmetry caused by spinning affects the exterior ballistic characteristics and shooting accuracy of a gun with the rifled barrel. To gain a deeper understanding of the complex sabot discard performance for the armor-piercing, fin-stabilized discarding sabot (APFSDS), a numerical investigation is performed to assess the effects of the spin rate on the sabot discard characteristics. We obtain the calculation boundary by the interior ballistics and the firing conditions and carry out a numerical simulation under different spin rates using computational fluid dynamics (CFD) and a dynamic mesh technique. We analyze four aspects of sabot discard characteristics, namely, sabot separation, rod surface pressure, rod aerodynamic parameters, and discarding quantization parameters. Computational results show that the sabot separation nearly presents perfect symmetry at 0 rad/s, and when the initial rate of the sabot increases, there is more obvious separation asymmetry, and it contributes to the relative position variation among the sabots and the rod. The distinction of rod surface pressure indicates that the choked flow is the strongest flow source, and the spin rate has almost no effect on the pressure of the rod front part. When the monitoring point moves towards the fins, the pressure distribution and intensity change more dramatically. The initial spin rate and separation asymmetry produce a variation in the surface pressure, which further influences the rod aerodynamic characteristics. The discarding quantization parameters exhibit a certain variation rule with its spin rate. 2,000 rad/s has a significant influence on the rod aerodynamic coefficients during the weak coupling phase. When the spin rate is in the range of 0–900 rad/s, the discarding characteristics remain the same. However, when the spin rate exceeds 900 rad/s, the separation time and aerodynamic impulse have a quadratic polynomial relationship with the rate. Additionally, a spin rate of 1,000 rad/s is the optimal value for a rifled barrel gun.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sabot Discard Characteristics under Different Spin Rates of the Rifled Barrel Launching APFSDS

Zhang

Wang

Liu

et al. 2021

Shock and Vibration

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“…It has been pointed out by [5] that the sabot discard process has an extremely important influence on the total firing error. During the process of sabot discard, though a set of mechanical and aerodynamic interferences may result in alteration of the projectile trajectory but it has been investigated that aerodynamic effects can be amplified source of launch disturbances [6, 7]. Hence, numerical investigations about aerodynamic interference have important research significance during the sabot discard.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on the sabots discard process of an APFSDS at different angles of attack

Huang

Xia²,

Cao³

et al. 2018

J. eng.

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“…[6][7][8] However, if the separation is done only with the difference in aerodynamic drag in free flight between the projectile and the sabot, a long travel distance, say, a few meters or more, is necessary in order to obtain the required separation distance; the assistance of a mechanical sabot "stripper" is necessary. In many cases of such aeromechanical separation, the sabot is composed of several pieces, each of which will experience an aerodynamic lift force.…”

Section: Introductionmentioning

confidence: 99%

Impactless, in-tube sabot separation technique useful for modest-sized supersonic ballistic ranges

Sasoh

Oshiba

2006

Review of Scientific Instruments

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A simple and high performance sabot separation technique which is useful even in about 10-m-long supersonic ballistic ranges has been developed. The normal in-flight sabot separation distance is vastly reduced by adding an addition tube with no diaphragm that may cause damage to the projectile. The launch tube of the ballistic range is subdivided to the acceleration, ventilation, and sabot separation sections. In the ventilation section, both the precursor shock wave driven by the sabot when coasting through the acceleration section and the driver gas is vented out to the dump chamber. In the sabot separation section, only the sabot experiences a great dragging pressure imbalance whereas the drag to the projectile is kept negligible. Initially, the whole system except for the driver gas chamber is connected without any diaphragm; the range operation is not accompanied by any high-speed impact among the sabot, diaphragm, and other related solid parts. The experimental environment can be kept clean. The influence of the muzzle blast is eliminated within a reasonably short distance from the muzzle because it delays owing to the ventilation section. Calibration experiments and the demonstration of flow visualization and boom measurement of supersonic flight were conducted using a 25 mm bore, Mach-2 ballistic range.

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Aerodynamic Interference during Sabot Discard

Cited by 31 publications

References 2 publications

Sabot Discard Characteristics under Different Spin Rates of the Rifled Barrel Launching APFSDS

Sabot Discard Characteristics under Different Spin Rates of the Rifled Barrel Launching APFSDS

Numerical investigations on the sabots discard process of an APFSDS at different angles of attack

Impactless, in-tube sabot separation technique useful for modest-sized supersonic ballistic ranges

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