一种新型液态CO_2播撒设备研制与播撒试验  

LC seeding device development and operating experimentation

作　　者：陈保国[1] 陈争旗[1] 樊鹏[1] 何军[1] 郭强[1] 

机构地区：[1]陕西省人工影响天气中心,陕西西安710015

出　　处：《西北大学学报（自然科学版）》2007年第4期661-664,共4页Journal of Northwest University（Natural Science Edition）

基　　金：国家科技部"西部开发科技行动"重大攻关基金资助项目(2001BA901A41)

摘　　要：目的研制一套适于陕西播云作业的液态二氧化碳(简称LC)播撒设备,开发LC催化技术方法,试验得出最佳播撒速率,提高作业效果。方法根据播云作业需要,提出技术指标,开发研制LC播撒设备和催化技术,并进行地面、空中试验(静态、动态试验)。结果①LC的纯度是决定喷撒质量的关键;②当环境温度较高时,LC小粒子浓度较高,谱型较窄,当环境温度较低时,粒子谱明显拓宽,峰值浓度降低;③地面使用0.6 mm喷头,喷撒速率为10～12 g/s,喷头距离激光束为10cm时,PMS粒子测量系统检测到LC粒子谱宽在0.5～175μm之间,小粒子平均总数密度为146个/cm3。冰雪晶平均总密度为71个/L。结论陕西春、秋季适宜催化的降水云系云体温度较高,LC宜作为播云首选冷云催化剂。多次播云催化试验表明,当播撒率为10～12 g/s时,作业数分钟后机载PMS粒子测量系统和地面雷达检测到云物理响应参数,与云的本底值对比分析证明:播撒LC有利于云水向雨水的转化,催化效果较好。Aim To develop a set of LC seeding device and operating technique suitable for cloud seeding in Shaanxi province,get optimal seeding velocity by experimentation,thereby enhance the seeding effect.Methods Put forward seeding index following the cloud operation,develope LC seeding device and operating technique and carry out ground and aerial experimentation（static and dynamic）.Results ①LC＇s purity is a key factor of spraying;②the consistency of LC particle is thicker in higher temperature and the spectrum is narrow,when temperature falls,the spectrum grows wider and peak consistency lower;③in ground experimentation,when the nozzle diameter is 0.6 mm,spraying speed 10～12 g/s,and the nozzle is 10 cm from laser beam,the data detected by PMS are as follows： LC spectrum width is 0.5～175 μm,the particle total number＇s average consistency is 146/cm^3,the ice crystal＇s average consistency is 71/L.Conclusion LC should be chosen as first activator of cold cloud seeding in spring and fall of Shaanxi province because of the cloud＇s higher temperature.Several times experimentations indicate： when seeding rate is 10～12 g/s,it is proved by contrast between cloud physical respond parameter detected by PMS and ground radar and the cloud＇s background data several minutes after seeding that LC seeding enhance the chance of cloud transform to rain so as to get better seeding effect.

关 键 词：LC设备研制 地面试验 空中试验 

分 类 号：P481[天文地球—大气科学及气象学]