管径

D

( 毫米 )

m

a 0

K

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.55

0.6

0.65

0.7

15

a 0

K

0.6155

0.0013

0.6192

0.0026

0.6257

0.0040

0.6335

0.0054

0.6426

0.0069

0.6532

0.0070

0.6654

0.0099

0.6815

0.0118

0.6992

0.0134

0.7192

0.0154

0.7406

0.0174

0.7673

0.0197

0.7961

0.0221

0.8223

0.0246

20

a 0

K

0.6151

0.0023

0.6188

0.0047

0.6252

0.0071

0.6330

0.0096

0.6423

0.0122

0.6528

0.0125

0.6647

0.0177

0.6808

0.0207

0.6984

0.0239

0.7184

0.0273

0.7398

0.0309

0.7664

0.0349

0.7953

0.0393

0.8218

0.0437

25

a 0

K

0.6137

0.0037

0.6184

0.0073

0.6247

0.0111

0.6325

0.0150

0.6417

0.0190

0.6524

0.0232

0.6640

0.0275

0.6801

0.0322

0.6976

0.0371

0.7176

0.0425

0.7390

0.0481

0.7655

0.0544

0.7945

0.0612

0.8215

0.0681

38

a 0

K

0.6137

0.0084

0.6173

0.0169

0.6234

0.0256

0.6313

0.0236

0.6402

0.0329

0.6512

0.0425

0.6624

0.0525

0.6783

0.0634

0.6954

0.0748

0.7154

0.0870

0.7371

0.1001

0.7633

0.1145

0.7923

0.1301

0.8208

0.1464

50

a 0

K

0.6128

0.0145

0.6162

0.0292

0.6221

0.0333

0.6293

0.0487

0.6387

0.0633

0.6492

0.0799

0.6607

0.0972

0.6764

0.1159

0.6934

0.1355

0.7134

0.1567

0.7350

0.1793

0.7610

0.2041

0.7900

0.2311

0.8200

0.2598

75

a 0

K

0.6109

0.0306

0.6140

0.0655

0.6196

0.0992

0.6261

0.1337

0.6357

0.1696

0.6460

0.20622

0.6574

0.2456

0.6727

0.2872

0.6892

0.3310

0.7092

0.3785

0.7310

0.4292

0.7565

0.4845

0.7858

0.5452

0.8185

0.6116

100

a 0

K

0.6090

0.0578

0.6117

0.1161

0.6170

0.1755

0.6238

0.2366

0.6327

0.3001

0.6428

0.3547

0.6541

0.4231

0.6690

0.4965

0.6850

0.5736

0.7050

0.6576

0.7270

0.7461

0.7520

0.8436

0.7815

0.9513

0.8170

0.0726

125

a 0

K

0.6078

0.0901

0.6105

0.1810

0.6160

0.2740

0.6223

0.3690

0.6310

0.4677

0.6411

0.5703

0.6524

0.6770

0.6675

0.7917

0.6835

0.9120

0.7032

1.0245

0.7252

1.1826

0.7500

1.3343

0.7794

1.5021

0.8145

1.6905

150

a 0

K

0.6067

0.1293

0.6093

0.2602

0.6150

0.3939

0.6209

0.5302

0.6294

0.6718

0.6394

0.8190

0.6506

0.9722

0.6660

1.1374

0.6820

1.3103

0.7015

1.4976

0.7235

1.6990

0.7480

1.9162

0.7773

2.1572

0.8120

2.4268

175

a 0

K

0.6055

0.1760

0.6081

0.3534

0.6134

0.5347

0.6195

0.7200

0.6277

0.9120

0.6377

1.1118

0.6488

1.3197

0.6645

1.5447

0.6805

1.7800

0.6998

2.0334

0.7218

2.3071

0.7460

2.6012

0.7751

2.9279

0.8095

3.2756

200

a 0

K

0.6043

0.2294

0.6069

0.4607

0.6119

0.6979

0.6180

0.9382

0.6260

1.1879

0.6360

1.4483

0.6470

1.7189

0.6630

2.0130

0.6790

2.3193

0.6980

2.6491

0.7200

3.0058

0.7440

3.3884

0.7730

3.8138

0.8070

4.2651

225

a 0

K

0.6035

0.2899

0.6059

0.5812

0.6109

0.8804

0.6172

1.1858

0.6255

1.5023

0.6355

1.8315

0.6465

2.1738

0.6622

2.5446

0.6782

2.9318

0.6972

3.3489

0.7190

3.7990

0.7430

4.2826

0.7717

4.8188

0.8057

5.3892

250

a 0

K

0.6027

0.3575

0.6050

0.7175

0.6100

0.0852

0.6165

1.4623

0.6250

1.8531

0.6350

2.2593

0.6460

2.6816

0.6615

3.1382

0.6775

3.6159

0.6965

4.1303

0.7180

4.6835

0.7420

5.2801

0.7705

5.9398

0.8045

6.6434

275

a 0

K

0.6018

0.4318

0.6040

0.8639

0.6090

1.3109

0.6157

1.7710

0.6245

2.2406

0.6345

2.7316

0.6455

3.2422

0.6608

3.7932

0.6768

4.3706

0.6958

4.9926

0.7170

5.6663

0.7410

6.3803

0.7693

7.1760

0.8033

8.0264

300

a 0

K

0.6010

0.5132

0.6030

0.0298

0.6080

1.5576

0.6150

2.1006

0.6240

2.6642

0.6340

3.2483

0.6450

3.8555

0.6600

4.5087

0.6760

5.1953

0.6950

5.9347

0.7160

6.7255

0.7400

7.5828

0.7680

8.5255

0.8020

9.5366