octadecane-2,4-dione | 65351-34-0

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: octadecane-2,4-dione
• 英文别名: Octadecan-2,4-dion；Pentadecoylaceton
• CAS: 65351-34-0
• 化学式: C₁₈H₃₄O₂
• 分子量: 282.467
• InChiKey: IDDOXBGUYHBSKX-UHFFFAOYSA-N

物化性质

• 熔点：
  42 °C
• 沸点：
  377.8±15.0 °C(Predicted)
• 密度：
  0.882±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  6.7
• 重原子数：
  20
• 可旋转键数：
  15
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.89
• 拓扑面积：
  34.1
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  2-十六烷酮 、 乙酸乙酯 在 sodium 作用下， 生成 octadecane-2,4-dione
  参考文献：
  名称：

  Flow Stabilization in a Transonic Wind Tunnel with a Second Throat

  摘要：

  A second throat has been used to stabilize the how in the test section of an induction-driven transonic wind tunnel. Different second throat configurations were attempted by employing simple wall-fixed flaps and a centerline-fixed strut, and their efficiency based on the duration of stable test section how was examined. Generally, a longer duration of stable flow could be achieved when the tunnel was operated with a second throat than without one. Moreover, a longer run time was achieved with the wall-fixed flaps than with the center strut. The performance of the center strut was so poor that it raised concerns about the installation of the sting support, which is usually installed in the same manner as the center strut. It was also found that when the flaps were installed vertically on the sidewalls the low-momentum reentry how from the plenum chamber reduced the effectiveness of the flaps in choking the how The performance was greatly improved by repositioning the flaps horizontally and directly behind the reentry region. However, there was an upper limit to the effectiveness of the flaps in choking the how Beyond a certain injector total pressure the effective cross-sectional area of the diffuser at the injector's location was reduced by the jet, turning it into the effective throat area. The cross-sectional area at the second throat is rendered ineffective, causing the Mach number in the test section to temporarily drop.

  DOI：

  10.2514/2.2708

文献信息

• Flow Stabilization in a Transonic Wind Tunnel with a Second Throat
  作者：Thombi Layukallo、Yoshiaki Nakamura

  DOI：10.2514/2.2708

  日期：2000.11

  A second throat has been used to stabilize the how in the test section of an induction-driven transonic wind tunnel. Different second throat configurations were attempted by employing simple wall-fixed flaps and a centerline-fixed strut, and their efficiency based on the duration of stable test section how was examined. Generally, a longer duration of stable flow could be achieved when the tunnel was operated with a second throat than without one. Moreover, a longer run time was achieved with the wall-fixed flaps than with the center strut. The performance of the center strut was so poor that it raised concerns about the installation of the sting support, which is usually installed in the same manner as the center strut. It was also found that when the flaps were installed vertically on the sidewalls the low-momentum reentry how from the plenum chamber reduced the effectiveness of the flaps in choking the how The performance was greatly improved by repositioning the flaps horizontally and directly behind the reentry region. However, there was an upper limit to the effectiveness of the flaps in choking the how Beyond a certain injector total pressure the effective cross-sectional area of the diffuser at the injector's location was reduced by the jet, turning it into the effective throat area. The cross-sectional area at the second throat is rendered ineffective, causing the Mach number in the test section to temporarily drop.